/// <summary>
/// DataRow转实体
/// </summary>
/// <param name="dataRecord">DataRow</param>
/// <returns>DataRow转实体</returns>
public static DataTableEntityBuilder <Entity> CreateBuilder(DataRow dataRecord)
{
DataTableEntityBuilder <Entity> dynamicBuilder = new DataTableEntityBuilder <Entity>();
DynamicMethod method = new DynamicMethod("DataTableDynamicCreateEntity", typeof(Entity), new Type[] { typeof(DataRow) }, typeof(Entity), true);
ILGenerator generator = method.GetILGenerator();
LocalBuilder result = generator.DeclareLocal(typeof(Entity));
generator.Emit(OpCodes.Newobj, typeof(Entity).GetConstructor(Type.EmptyTypes));
generator.Emit(OpCodes.Stloc, result);
for (int i = 0; i < dataRecord.ItemArray.Length; i++)
{
PropertyInfo propertyInfo = typeof(Entity).GetProperty(dataRecord.Table.Columns[i].ColumnName);
Label endIfLabel = generator.DefineLabel();
if (propertyInfo.IsNotNull() && propertyInfo.GetSetMethod().IsNotNull())
{
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldc_I4, i);
generator.Emit(OpCodes.Callvirt, isDBNullMethod);
generator.Emit(OpCodes.Brtrue, endIfLabel);
generator.Emit(OpCodes.Ldloc, result);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldc_I4, i);
generator.Emit(OpCodes.Callvirt, getValueMethod);
generator.Emit(OpCodes.Unbox_Any, propertyInfo.PropertyType);
generator.Emit(OpCodes.Callvirt, propertyInfo.GetSetMethod());
generator.MarkLabel(endIfLabel);
}
}
generator.Emit(OpCodes.Ldloc, result);
generator.Emit(OpCodes.Ret);
dynamicBuilder.handler = (Load)method.CreateDelegate(typeof(Load));
return(dynamicBuilder);
}
/// <summary>
/// 最快 DataTable To 实体列表 IL
/// </summary>
/// <example>
/// <code>
/// Data.GetDataTable("Select MemberID,RealName from UC_Member").ToList<UC_Member>();
/// </code>
/// </example>
/// <typeparam name="TResult">返回值类型</typeparam>
/// <param name="dt">DataTable</param>
/// <returns>实体列表</returns>
public static List <TResult> ToList <TResult>(this DataTable dt) where TResult : class, new()
{
List <TResult> list = new List <TResult>();
if (dt.IsNull() || dt.Rows.Count == 0)
{
return(list);
}
DataTableEntityBuilder <TResult> eblist = DataTableEntityBuilder <TResult> .CreateBuilder(dt.Rows[0]);
foreach (DataRow info in dt.Rows)
{
list.Add(eblist.Build(info));
}
dt.Dispose(); dt = null;
return(list);
}
