cyf
253 lines
7.8 KiB
C#
253 lines
7.8 KiB
C#
/******************************************************************************
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Copyright 2005-2007 R2@DevFx.NET
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DevFx.NET is free software; you can redistribute it and/or modify
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it under the terms of the Lesser GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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DevFx.NET is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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Lesser GNU General Public License for more details.
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You should have received a copy of the Lesser GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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/*******************************************************************************/
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Reflection;
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using Lskj.DevFx.Data.Attributes;
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namespace Lskj.DevFx.Data
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{
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/// <summary>
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/// 实现<see cref="IFieldMemberInfo"/>接口
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/// </summary>
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public class FieldMemberInfo : IFieldMemberInfo
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{
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#region constructor
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/// <summary>
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/// 构造方法
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/// </summary>
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/// <param name="columnAttribute">特性</param>
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/// <param name="property">属性信息</param>
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public FieldMemberInfo(ColumnAttribute columnAttribute, PropertyInfo property) {
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this.columnAttribute = columnAttribute;
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this.property = property;
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this.memberInfo = property;
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this.name = columnAttribute.ColumnName == null ? property.Name : columnAttribute.ColumnName;
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this.canRead = !columnAttribute.WriteOnly && property.CanRead;
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this.canWrite = !columnAttribute.ReadOnly && property.CanWrite;
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}
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/// <summary>
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/// 构造方法
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/// </summary>
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/// <param name="columnAttribute">特性</param>
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/// <param name="field">字段信息</param>
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public FieldMemberInfo(ColumnAttribute columnAttribute, FieldInfo field) {
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this.columnAttribute = columnAttribute;
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this.field = field;
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this.memberInfo = field;
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this.name = columnAttribute.ColumnName == null ? field.Name : columnAttribute.ColumnName;
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this.canRead = !columnAttribute.WriteOnly;
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this.canWrite = !columnAttribute.ReadOnly;
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}
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#endregion
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#region private members
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private ColumnAttribute columnAttribute;
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private PropertyInfo property;
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private FieldInfo field;
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private MemberInfo memberInfo;
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private string name;
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private bool canRead;
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private bool canWrite;
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#endregion
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#region IFieldMemberInfo Members
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/// <summary>
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/// 字段是否可读
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/// </summary>
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public bool CanRead {
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get { return this.canRead; }
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}
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/// <summary>
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/// 字段是否可写
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/// </summary>
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public bool CanWrite {
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get { return this.canWrite; }
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}
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/// <summary>
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/// 字段名
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/// </summary>
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public string Name {
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get { return this.name; }
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}
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/// <summary>
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/// 字段加载的成员信息<see cref="IFieldMemberInfo.MemberInfo"/>
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/// </summary>
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public MemberInfo MemberInfo {
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get { return this.memberInfo; }
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}
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/// <summary>
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/// 字段本身的加载信息<see cref="ColumnAttribute"/>
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/// </summary>
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public ColumnAttribute Column {
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get { return this.columnAttribute; }
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}
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/// <summary>
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/// 获取字段的值
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/// </summary>
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/// <param name="obj">包含此字段的实例</param>
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/// <returns>字段的值</returns>
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public object GetValue(object obj) {
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if(this.property != null) {
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return this.property.GetValue(obj, null);
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} else {
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return this.field.GetValue(obj);
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}
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}
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/// <summary>
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/// 设置字段的值
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/// </summary>
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/// <param name="obj">包含此字段的实例</param>
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/// <param name="value">字段的值</param>
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public void SetValue(object obj, object value) {
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Type type;
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if(this.property != null) {
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type = this.property.PropertyType;
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} else {
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type = this.field.FieldType;
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}
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if(Convert.IsDBNull(value)) {
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if(this.columnAttribute.DefaultValue != null) {
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value = this.columnAttribute.DefaultValue;
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} else if(!type.IsValueType) {
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value = null;
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} else {
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return;
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}
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}
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if(this.property != null) {
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this.property.SetValue(obj, value, null);
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} else {
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this.field.SetValue(obj, value);
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}
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}
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#endregion
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#region static members
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private static Dictionary<Type, IFieldMemberInfo[]> cache = new Dictionary<Type,IFieldMemberInfo[]>();
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private static object lockObject = new object();
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/// <summary>
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/// 字段绑定预置值
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/// </summary>
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public const BindingFlags FieldBindingFlags = BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance;
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/// <summary>
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/// 获取绑定的字段信息列表
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/// </summary>
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/// <param name="type">被获取的类型</param>
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/// <returns>IFieldMemberInfo[]</returns>
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public static IFieldMemberInfo[] GetFieldMembers(Type type) {
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return GetFieldMembers(type, FieldBindingFlags);
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}
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/// <summary>
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/// 获取绑定的字段信息列表
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/// </summary>
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/// <param name="type">被获取的类型</param>
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/// <param name="columnBindingFlags">绑定标识</param>
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/// <returns>IFieldMemberInfo[]</returns>
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public static IFieldMemberInfo[] GetFieldMembers(Type type, BindingFlags columnBindingFlags) {
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return GetFieldMembers(type, columnBindingFlags, false);
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}
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/// <summary>
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/// 获取绑定的字段信息列表
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/// </summary>
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/// <param name="type">被获取的类型</param>
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/// <param name="columnBindingFlags">绑定标识</param>
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/// <param name="inherit">是否包含继承类</param>
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/// <returns>IFieldMemberInfo[]</returns>
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public static IFieldMemberInfo[] GetFieldMembers(Type type, BindingFlags columnBindingFlags, bool inherit) {
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if(cache.ContainsKey(type)) {
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return cache[type];
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}
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lock (lockObject) {
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if (cache.ContainsKey(type)) {
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return cache[type];
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}
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ArrayList fieldMembers = new ArrayList();
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PropertyInfo[] props = type.GetProperties(columnBindingFlags);
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for (int i = 0; i < props.Length; i++) {
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ColumnAttribute[] columnAttributes = (ColumnAttribute[])props[i].GetCustomAttributes(typeof(ColumnAttribute), inherit);
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if (columnAttributes != null && columnAttributes.Length > 0) {
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fieldMembers.Add(new FieldMemberInfo(columnAttributes[0], props[i]));
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}
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}
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FieldInfo[] fields = type.GetFields(columnBindingFlags);
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for (int i = 0; i < fields.Length; i++) {
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ColumnAttribute[] columnAttributes = (ColumnAttribute[])fields[i].GetCustomAttributes(typeof(ColumnAttribute), inherit);
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if (columnAttributes != null && columnAttributes.Length > 0) {
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fieldMembers.Add(new FieldMemberInfo(columnAttributes[0], fields[i]));
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}
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}
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IFieldMemberInfo[] members = (IFieldMemberInfo[])fieldMembers.ToArray(typeof(IFieldMemberInfo));
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if (!cache.ContainsKey(type)) {
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cache.Add(type, members);
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}
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return members;
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}
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}
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/// <summary>
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/// 获取绑定的字段信息
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/// </summary>
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/// <param name="type">被获取的类型</param>
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/// <param name="fieldName">字段名</param>
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/// <param name="columnBindingFlags">绑定标识</param>
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/// <param name="inherit">是否包含继承类</param>
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/// <returns>IFieldMemberInfo</returns>
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public static IFieldMemberInfo GetFieldMember(Type type, string fieldName, BindingFlags columnBindingFlags, bool inherit) {
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PropertyInfo prop = type.GetProperty(fieldName, columnBindingFlags);
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if(prop != null) {
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ColumnAttribute[] columnAttributes = (ColumnAttribute[])prop.GetCustomAttributes(typeof(ColumnAttribute), inherit);
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if(columnAttributes != null && columnAttributes.Length > 0) {
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return new FieldMemberInfo(columnAttributes[0], prop);
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}
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}
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FieldInfo field = type.GetField(fieldName, columnBindingFlags);
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if(field != null) {
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ColumnAttribute[] columnAttributes = (ColumnAttribute[])field.GetCustomAttributes(typeof(ColumnAttribute), inherit);
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if(columnAttributes != null && columnAttributes.Length > 0) {
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return new FieldMemberInfo(columnAttributes[0], field);
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}
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}
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return null;
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}
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#endregion
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}
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}
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