C# 反射

/// <summary>
/// 封装反射的一些方法
/// </summary>
public class Reflection
{
/// <summary>
/// 根据源对象的属性填充目标对象的对应字段
/// </summary>
/// <param name="source">获取数据的源对象</param>
/// <param name="target">填充数据的目标对象</param>
public static void GetViewModelProperties(object source, object target)
{
if (source != null)
{
foreach (PropertyInfo item in target.GetType().GetProperties())
{
var attr = source.GetType().GetProperties().FirstOrDefault(p => p.Name == item.Name);
if (attr != null)
{
var value = attr.GetValue(source, null);
// 不为null或空的数据才填入，确保有意义
if (value != null && !string.IsNullOrEmpty(value.ToString()))
item.SetValue(target, value, null);

}
}
}
}

/// <summary>
/// 获取修改后不同字段对应的DisplayName特性和修改前对应的值
/// </summary>
/// <param name="bObj">修改前的对象</param>
/// <param name="AObj">修改后的对象</param>
/// <returns>特性名和修改前的值组合字符串，" , "分割</returns>
public static string GetDisplayNameFromComparedObject(object bObj, object AObj)
{
string recordStr = string.Empty;
foreach (var item in AObj.GetType().GetProperties())
{
var modelAttr = bObj.GetType().GetProperty(item.Name);
object oldValue = modelAttr.GetValue(bObj, null);
object value = item.GetValue(AObj, null);
if (oldValue == null || value == null)
continue;
if (!oldValue.Equals(value))
{
// 获取DisplayName特性值
object[] objs = item.GetCustomAttributes(typeof(DisplayNameAttribute), true);
if (objs.Length > 0)
{
DisplayNameAttribute attr = objs[0] as DisplayNameAttribute;
if (attr != null)
recordStr += attr.DisplayName + ":" + oldValue + " , ";
}
}
}
return recordStr;
}
/// <summary>
/// 根据列表生成表头为DisplayName的DataTable
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="lst"></param>
/// <returns></returns>
public static DataTable GetDisplayNameToDataTable<T>(List<T> lst)
{
DataTable dt = new DataTable();
foreach (var item in typeof(T).GetProperties())
{
string displayName = string.Empty;
object[] objs = item.GetCustomAttributes(typeof(DisplayNameAttribute), true);
if (objs.Length > 0)
displayName = (objs[0] as DisplayNameAttribute).DisplayName;

dt.Columns.Add(new DataColumn(displayName, item.PropertyType));
}

foreach (var report in lst)
{
DataRow dr = dt.NewRow();
foreach (var item in report.GetType().GetProperties())
{
string displayName = string.Empty;
object[] objs = item.GetCustomAttributes(typeof(DisplayNameAttribute), true);
if (objs.Length > 0)
displayName = (objs[0] as DisplayNameAttribute).DisplayName;

dr[displayName] = item.GetValue(report, null);
}
dt.Rows.Add(dr);
}
return dt;
}
}