public static DataReaderEntityBuilder <T> CreateBuilder(Type type, IDataRecord dataRecord)
{
{
DataReaderEntityBuilder <T> dynamicBuilder = new DataReaderEntityBuilder <T>();
DynamicMethod method = new DynamicMethod("DynamicCreateEntity", type,
new Type[] { typeof(IDataRecord) }, type, true);
ILGenerator generator = method.GetILGenerator();
LocalBuilder result = generator.DeclareLocal(type);
generator.Emit(OpCodes.Newobj, type.GetConstructor(Type.EmptyTypes));
generator.Emit(OpCodes.Stloc, result);
for (int i = 0; i < dataRecord.FieldCount; i++)
{
string fieldName = dataRecord.GetName(i);
PropertyInfo propertyInfo = type.GetProperty(fieldName);
Label endIfLabel = generator.DefineLabel();
if (propertyInfo != null && propertyInfo.GetSetMethod() != null)
{
bool isNullable = false;
var underType = MappingUntilTool.GetUnderType(propertyInfo, ref isNullable);
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);
GeneratorCallMethod(generator, underType, isNullable, propertyInfo, dataRecord.GetDataTypeName(i), fieldName);
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>
/// Reader转成List《T》
/// </summary>
/// <typeparam name="TResult"></typeparam>
/// <param name="dr"></param>
/// <param name="isClose"></param>
/// <returns></returns>
internal static List <T> DataReaderToList <T>(Type type, IDataReader dr, string fields, bool isClose = true, bool isTry = true)
{
if (type.Name.Contains("KeyValuePair"))
{
List <T> strReval = new List <T>();
FillValueTypeToDictionary(type, dr, strReval);
return(strReval);
}
//值类型
else if (type.IsValueType || type == MappingUntilTool.StringType)
{
List <T> strReval = new List <T>();
FillValueTypeToDr <T>(type, dr, strReval);
return(strReval);
}
//数组类型
else if (type.IsArray)
{
List <T> strReval = new List <T>();
FillValueTypeToArray(type, dr, strReval);
return(strReval);
}
var cacheManager = CacheManager <DataReaderEntityBuilder <T> > .GetInstance();
string key = "DataReaderToList." + fields + type.FullName;
DataReaderEntityBuilder <T> eblist = null;
if (cacheManager.ContainsKey(key))
{
eblist = cacheManager[key];
}
else
{
eblist = DataReaderEntityBuilder <T> .CreateBuilder(type, dr);
cacheManager.Add(key, eblist, cacheManager.Day);
}
List <T> list = new List <T>();
try
{
if (dr == null)
{
return(list);
}
while (dr.Read())
{
list.Add(eblist.Build(dr));
}
if (isClose)
{
dr.Close(); dr.Dispose(); dr = null;
}
}
catch (Exception ex)
{
if (isClose)
{
dr.Close(); dr.Dispose(); dr = null;
}
throw ex;
}
return(list);
}
