public void GetMemberValue(CodeGenerator generator, ArgBuilder targetObject, string memberName, ref LocalBuilder memberValue)
{
LocalBuilder locValue = generator.DeclareLocal(typeof(string));
Type targetType = memberValue.LocalType;
Type originalType = ConvertorGeneratorHelper.GetOriginalType(targetType);
generator.Ldarg(targetObject);
generator.Load(memberName);
generator.Call(typeof(NameValueCollection).GetMethod("get_Item", new Type[] { typeof(string) }));
generator.Stloc(locValue);
if (targetType.IsAssignableFrom(typeof(string)))
{
generator.Ldloc(locValue);
generator.Stloc(memberValue);
return;
}
else
{
generator.Ldloc(locValue);
generator.Call(typeof(string).GetMethod("IsNullOrEmpty"));
generator.Load(true);
generator.If(Cmp.NotEqualTo);
if (targetType == typeof(Guid))
{
generator.Ldloc(locValue);
generator.New(typeof(Guid).GetConstructor(new Type[] { typeof(string) }));
generator.Stloc(memberValue);
}
else
{
MethodInfo parseMethod = targetType.GetMethod("Parse", new Type[] { typeof(string) });
if (parseMethod != null)
{
generator.Ldloc(locValue);
generator.Call(parseMethod);
generator.Stloc(memberValue);
}
else
{
generator.Ldloc(locValue);
generator.Load(originalType);
generator.Call(typeof(Convert).GetMethod("ChangeType", new Type[] { typeof(object), typeof(Type) }));
if (targetType.IsValueType)
{
generator.UnboxAny(targetType);
}
generator.Stloc(memberValue);
}
}
generator.Else();
generator.LoadDefaultValue(targetType);
generator.Stloc(memberValue);
generator.EndIf();
}
}
public void GetMemberValue(CodeGenerator generator, ArgBuilder targetObject, string memberName, ref LocalBuilder memberValue)
{
Type inputType = targetObject.ArgType;
MemberInfo memberInfo = ConvertorGeneratorHelper.GetMemberInfo(inputType, memberName);
if (memberInfo == null)
{
return;
}
Type srcMemberType = ConvertorGeneratorHelper.GetMemberType(memberInfo);
Type destMemberType = memberValue.LocalType;
if (memberValue.LocalType.IsAssignableFrom(srcMemberType))
{
generator.Ldarg(targetObject);
generator.LoadMember(memberInfo);
generator.Stloc(memberValue);
return;
}
Type converTargetType = ConvertorGeneratorHelper.GetOriginalType(destMemberType);
Type convertSourceType = ConvertorGeneratorHelper.GetOriginalType(srcMemberType);
//源字段类型是否实现了IConvertible
if (typeof(IConvertible).IsAssignableFrom(convertSourceType))
{
generator.Ldarg(targetObject);
generator.LoadMember(memberInfo);
if (convertSourceType.IsValueType)
{
//一定要是原类型
generator.Box(srcMemberType);
}
generator.Load(converTargetType);
generator.Call(typeof(Convert).GetMethod("ChangeType", new Type[] { typeof(object), typeof(Type) }));
if (destMemberType.IsValueType)
{
generator.UnboxAny(destMemberType);
}
generator.Stloc(memberValue);
}
}
public void GetMemberValue(CodeGenerator generator, ArgBuilder targetObject, string memberName, ref LocalBuilder memberValue)
{
LocalBuilder tempLocal = generator.DeclareLocal(typeof(object), "dataColumn");
Type targetType = memberValue.LocalType;
Type originalType = ConvertorGeneratorHelper.GetOriginalType(targetType);
generator.Ldarg(targetObject);
generator.Load(memberName);
generator.Call(typeof(IDictionary).GetMethod("get_Item", new Type[] { typeof(object) }));
generator.Stloc(tempLocal);
generator.Ldloc(tempLocal);
generator.LoadMember(typeof(DBNull).GetField("Value", BindingFlags.Static | BindingFlags.Public));
generator.If(Cmp.EqualTo);
generator.LoadDefaultValue(targetType);
generator.Stloc(memberValue);
generator.Else();
generator.Ldloc(tempLocal);
//值是否是目标类型的对象
generator.InternalILGenerator.Emit(OpCodes.Isinst, targetType);
generator.InternalILGenerator.Emit(OpCodes.Ldnull);
generator.InternalILGenerator.Emit(OpCodes.Cgt_Un);
generator.Load(true);
generator.If(Cmp.EqualTo);
generator.Ldloc(tempLocal);
if (targetType.IsValueType)
{
generator.UnboxAny(targetType);
}
generator.Stloc(memberValue);
generator.Else();
if (targetType == typeof(Guid))
{
generator.Ldloc(tempLocal);
generator.InternalILGenerator.Emit(OpCodes.Isinst, typeof(string));
generator.InternalILGenerator.Emit(OpCodes.Ldnull);
generator.InternalILGenerator.Emit(OpCodes.Cgt_Un);
generator.Load(true);
generator.If(Cmp.EqualTo);
generator.Ldloc(tempLocal);
generator.New(typeof(Guid).GetConstructor(new Type[] { typeof(string) }));
generator.Stloc(memberValue);
}
else
{
generator.Ldloc(tempLocal);
generator.InternalILGenerator.Emit(OpCodes.Isinst, typeof(IConvertible));
generator.InternalILGenerator.Emit(OpCodes.Ldnull);
generator.InternalILGenerator.Emit(OpCodes.Cgt_Un);
generator.Load(true);
generator.If(Cmp.EqualTo);
generator.Ldloc(tempLocal);
generator.Load(originalType);
generator.Call(typeof(Convert).GetMethod("ChangeType", new Type[] { typeof(object), typeof(Type) }));
if (targetType.IsValueType)
{
generator.UnboxAny(targetType);
}
generator.Stloc(memberValue);
}
generator.Else();
generator.LoadDefaultValue(targetType);
generator.Stloc(memberValue);
generator.EndIf();
generator.EndIf();
generator.EndIf();
}