SVN r964
SVN-Revision: r964
This commit is contained in:
tdx
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// ============================================================================
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// LabPicUrlPreview.cs （C# 7.3 / DevExpress 15.2 兼容）
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// - 公用方法封装在一个类里
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// - 事件绑定在一个地方 Attach(view)
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// - 线程安全缓存 + 并发限流 + LRU 清理
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// - 只在同步阶段写 e.Value；异步完成后刷新单元格
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// ============================================================================
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using System;
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using System.Collections.Generic;
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using System.Data;
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using System.Drawing;
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using System.IO;
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using System.Linq;
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using System.Net;
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using System.Threading;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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using DevExpress.Data;
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using DevExpress.XtraEditors.Controls;
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using DevExpress.XtraEditors.Repository;
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using DevExpress.XtraGrid;
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using DevExpress.XtraGrid.Columns;
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using DevExpress.XtraGrid.Views.Base;
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using DevExpress.XtraGrid.Views.Grid;
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using DevExpress.XtraGrid.Views.BandedGrid;
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using Lskj.Business;
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using Lskj.Control.Model;
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// 若命名空间不同，请改成正确的 using
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public static class LabPicUrlPreview
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{
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// ====== 对外：初始化图片列（创建 RepositoryItemPictureEdit、设为 Unbound） ======
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public static void InitPicColumn(GridControl gridControl, GridColumn gridColumn, GridColumnModel model)
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{
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if (gridControl == null || gridColumn == null || model == null) return;
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gridColumn.AppearanceCell.Options.UseTextOptions = true;
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gridColumn.AppearanceCell.TextOptions.HAlignment = DevExpress.Utils.HorzAlignment.Center;
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gridColumn.OptionsColumn.AllowEdit = false;
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// 唯一列名（保持你原逻辑）
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gridColumn.FieldName = string.Format("{0}{1}", model.FieldName, Guid.NewGuid());
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gridColumn.Tag = model; // 事件里取模型
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RepositoryItemPictureEdit pictureEdit = new RepositoryItemPictureEdit();
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pictureEdit.ShowMenu = false;
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pictureEdit.NullText = " ";
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pictureEdit.SizeMode = PictureSizeMode.Zoom;
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gridControl.RepositoryItems.Add(pictureEdit);
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gridColumn.UnboundType = UnboundColumnType.Object;
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gridColumn.ColumnEdit = pictureEdit;
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}
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// ====== 对外：统一事件绑定入口（只需调用一次） ======
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public static void Attach(ColumnView view)
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{
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if (view == null) return;
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view.CustomUnboundColumnData -= OnCustomUnboundColumnData;
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view.CustomUnboundColumnData += OnCustomUnboundColumnData;
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}
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// ====== 事件实现（只在同步阶段写 e.Value；异步完成后刷新该单元格） ======
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private static void OnCustomUnboundColumnData(object sender, CustomColumnDataEventArgs e)
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{
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ColumnView view = sender as ColumnView;
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if (view == null) return;
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GridColumnModel m = e.Column.Tag as GridColumnModel;
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if (m == null || m.FieldType != ControlType.LabPicUrl || !e.IsGetData) return;
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// 1) 用 ListSourceRowIndex → RowHandle（兼容 DevExpress 15.2）
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int listIndex = e.ListSourceRowIndex;
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int rowHandle = view.GetRowHandle(listIndex);
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// 2) 读取原始 URL（优先 ListSource；兜底 e.Row）
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string raw = null;
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try
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{
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object val = view.GetListSourceRowCellValue(listIndex, m.FieldName);
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raw = val == null ? null : Convert.ToString(val);
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}
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catch
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{
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DataRowView drv = e.Row as DataRowView;
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if (drv != null && drv.Row != null && drv.Row.Table != null && drv.Row.Table.Columns.Contains(m.FieldName))
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raw = Convert.ToString(drv.Row[m.FieldName]);
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}
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if (string.IsNullOrWhiteSpace(raw)) return;
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// 3) 拼接完整 URL（相对路径 -> OA 根地址）
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string url = ResolveFullUrl(raw);
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// 4) 目标高（属性或方法都兼容；<=18 则用 30）
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int targetHeight = NormalizeHeight(m);
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// 5) 缓存命中：当次赋值（只在同步阶段写 e.Value）
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Image img;
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if (UrlImageCacheCompat.TryGet(url, targetHeight, out img))
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{
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e.Value = img;
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return;
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}
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// 6) 未命中：安排异步下载；完成后刷新该单元格（不要在异步线程里改 e.Value）
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System.Windows.Forms.Control invoker = view.GridControl; // UI 回调对象
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UrlImageCacheCompat.GetOrCreateAsync(url, targetHeight, invoker, delegate ()
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{
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RefreshCellCompat(view, rowHandle, e.Column);
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});
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}
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// ====== 视图安全刷新：GridView/BandedGridView 定向刷新，其他降级为 RefreshData ======
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private static void RefreshCellCompat(ColumnView view, int rowHandle, GridColumn column)
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{
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try
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{
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GridView gv = view as GridView;
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if (gv != null)
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{
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if (rowHandle >= 0) gv.RefreshRowCell(rowHandle, column);
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else gv.RefreshData();
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return;
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}
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BandedGridView bgv = view as BandedGridView;
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if (bgv != null)
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{
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if (rowHandle >= 0) bgv.RefreshRowCell(rowHandle, column);
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else bgv.RefreshData();
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return;
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}
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view.RefreshData();
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}
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catch
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{
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try { view.RefreshData(); } catch { }
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}
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}
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// ====== 兼容“属性或无参方法”的高度读取（避免 m.LabPicUrlHeight 被当作方法组出错） ======
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private static int NormalizeHeight(object model)
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{
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try
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{
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var t = model.GetType();
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// 属性
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var pi = t.GetProperty("LabPicUrlHeight");
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if (pi != null)
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{
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int v = Convert.ToInt32(pi.GetValue(model, null));
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return v <= 18 ? 30 : v;
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}
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// 无参方法
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var mi = t.GetMethod("LabPicUrlHeight", Type.EmptyTypes);
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if (mi != null)
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{
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int v = Convert.ToInt32(mi.Invoke(model, null));
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return v <= 18 ? 30 : v;
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}
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}
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catch { }
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return 30;
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}
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// ====== 解析完整 URL：相对路径 -> SystemInfo.Instance.OAUrl + 相对 ======
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private static string ResolveFullUrl(string raw)
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{
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if (string.IsNullOrEmpty(raw)) return raw;
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if (raw.StartsWith("http", StringComparison.OrdinalIgnoreCase)) return raw;
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try
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{
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// 直接使用你项目里的 SystemInfo（若没有可替换为你自己的配置）
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string oa = SystemInfo.Instance.OAUrl;
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if (string.IsNullOrEmpty(oa)) return raw.TrimStart('/');
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if (!oa.EndsWith("/")) oa += "/";
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return oa + raw.TrimStart('/');
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}
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catch
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{
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return raw.TrimStart('/');
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}
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}
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// ====== 线程安全缓存（WebClient + Dictionary + Semaphore，C# 7.3 兼容） ======
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private static class UrlImageCacheCompat
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{
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private class CacheEntry
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{
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public Image Image;
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public DateTime LastHitUtc;
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}
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private static readonly object _lock = new object();
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private static readonly Dictionary<string, CacheEntry> _cache =
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new Dictionary<string, CacheEntry>(StringComparer.OrdinalIgnoreCase);
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private static readonly Dictionary<string, Task<Image>> _tasks =
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new Dictionary<string, Task<Image>>(StringComparer.OrdinalIgnoreCase);
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// 旧框架用传统 Semaphore，限制并发下载数量
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private static readonly Semaphore _throttle = new Semaphore(4, 4); // 同时最多 4 个下载
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private const int Capacity = 300; // 最多缓存 300 张缩略图
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static UrlImageCacheCompat()
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{
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// 尽量启用 TLS1.2（老系统需要）
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try
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{
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const System.Security.Authentication.SslProtocols _Tls12 =
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(System.Security.Authentication.SslProtocols)0x00000C00;
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ServicePointManager.SecurityProtocol |= (SecurityProtocolType)_Tls12;
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}
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catch { }
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}
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private static string MakeKey(string url, int h)
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{
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return url + "#h=" + h.ToString();
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}
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public static bool TryGet(string url, int targetHeight, out Image image)
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{
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string key = MakeKey(url, targetHeight);
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lock (_lock)
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{
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CacheEntry e;
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if (_cache.TryGetValue(key, out e) && e != null && e.Image != null)
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{
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e.LastHitUtc = DateTime.UtcNow;
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_cache[key] = e;
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image = e.Image;
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return true;
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}
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}
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image = null;
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return false;
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}
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public static void GetOrCreateAsync(string url, int targetHeight, System.Windows.Forms.Control uiInvoker, Action onReady)
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{
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string key = MakeKey(url, targetHeight);
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lock (_lock)
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{
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// 已缓存：直接回调
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if (_cache.ContainsKey(key))
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{
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BeginInvokeSafe(uiInvoker, onReady);
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return;
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}
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// 同 key 只下载一次：已有任务则挂回调
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Task<Image> exist;
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if (_tasks.TryGetValue(key, out exist))
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{
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exist.ContinueWith(delegate { BeginInvokeSafe(uiInvoker, onReady); }, TaskScheduler.Default);
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return;
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}
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// 启动新任务（受限流）
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Task<Image> task = Task.Factory.StartNew<Image>(delegate
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{
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_throttle.WaitOne();
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try
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{
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using (WebClient wc = new WebClient())
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{
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byte[] bytes = wc.DownloadData(url);
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using (MemoryStream ms = new MemoryStream(bytes))
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using (Bitmap bmp = new Bitmap(ms))
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{
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return ScaleBitmap(bmp, targetHeight);
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}
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}
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}
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catch
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{
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return null;
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}
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finally
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{
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try { _throttle.Release(); } catch { }
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}
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}, CancellationToken.None, TaskCreationOptions.None, TaskScheduler.Default).ContinueWith<Image>(delegate (Task<Image> t)
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{
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Image result = t.Result;
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lock (_lock)
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{
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_tasks.Remove(key);
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if (result != null)
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{
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_cache[key] = new CacheEntry { Image = result, LastHitUtc = DateTime.UtcNow };
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TrimIfNeededUnsafe();
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}
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}
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return result;
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}, TaskScheduler.Default);
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_tasks[key] = task;
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task.ContinueWith(delegate { BeginInvokeSafe(uiInvoker, onReady); }, TaskScheduler.Default);
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}
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}
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private static Image ScaleBitmap(Bitmap bmp, int targetHeight)
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{
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int h = targetHeight <= 0 ? 30 : targetHeight;
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if (h < 18) h = 18;
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double ratio = (double)h / (double)bmp.Height;
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int w = (int)Math.Round((double)bmp.Width * ratio);
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if (w < 1) w = 1;
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// 只缓存缩略图，避免内存暴涨
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return new Bitmap(bmp, new Size(w, h));
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}
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private static void TrimIfNeededUnsafe()
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{
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if (_cache.Count <= Capacity) return;
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// 简单 LRU：移除最早命中的 10%
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List<KeyValuePair<string, CacheEntry>> list = _cache.ToList();
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list.Sort(delegate (KeyValuePair<string, CacheEntry> a, KeyValuePair<string, Ca
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