///<summary>
///</summary>
///<param name="dr"></param>
///<typeparam name="T"></typeparam>
///<returns></returns>
public List <T> GetList <T>(IDataReader dr)
{
var list = new List <T>();
var builder = DynamicBuilder <T> .CreateBuilder(dr);
while (dr.Read())
{
list.Add(builder.Build(dr));
}
dr.Close();
return(list);
}
///<summary>
///</summary>
///<param name="dataRecord"></param>
///<returns></returns>
public static DynamicBuilder <T> CreateBuilder(IDataRecord dataRecord)
{
var dynamicBuilder = new DynamicBuilder <T>();
var method = new DynamicMethod("DynamicCreate", typeof(T), new[] { typeof(IDataRecord) }, typeof(T), true);
var generator = method.GetILGenerator();
var result = generator.DeclareLocal(typeof(T));
generator.Emit(OpCodes.Newobj, typeof(T).GetConstructor(Type.EmptyTypes));
generator.Emit(OpCodes.Stloc, result);
for (var i = 0; i < dataRecord.FieldCount; i++)
{
var fieldName = dataRecord.GetName(i);
var propertyInfo = GetPropOfField(fieldName);
if (propertyInfo == null)
{
continue;
}
bool isNullable = propertyInfo.PropertyType.Name.ToLower().Contains("nullable"); //判断是否为可空类型
var endIfLabel = generator.DefineLabel();
if (propertyInfo.GetSetMethod() == null)
{
continue;
}
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, dataRecord.GetFieldType(i));
var type = dataRecord.GetFieldType(i);
generator.Emit(OpCodes.Unbox_Any, isNullable ? GetNullableType(type) : type);
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>
///</summary>
///<param name="dr"></param>
///<typeparam name="T"></typeparam>
///<returns></returns>
public T GetSingle <T>(IDataReader dr)
{
if (dr.Read())
{
var obj = DynamicBuilder <T> .CreateBuilder(dr).Build(dr);
if (!dr.IsClosed)
{
dr.Close();
}
return(obj);
}
if (!dr.IsClosed)
{
dr.Close();
}
return(default(T));
}
