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 override ConvertHandler GetConvertHandler(Type inputType, Type outputType, object inputObject, object outputObject, Dictionary<string, string> mappingNames, List<string> ignoreList, Dictionary<int, string> mappingOrders, bool mappingSpecifiedOnly)
{
//保存目标字段名，目标MemberInfo
Dictionary<string, string> distToSrc = new Dictionary<string, string>();
Dictionary<string, MemberInfo> members = new Dictionary<string, MemberInfo>();
//先查找显式映射
foreach (string sourceName in mappingNames.Keys)
{
MemberInfo sourceMember = ConvertorGeneratorHelper.GetMemberInfo(inputType, sourceName);
Check.Require(sourceMember != null, string.Format("member named {0} could not be found in {1}", sourceName, outputType.FullName));
distToSrc.Add(mappingNames[sourceName], sourceName);
members.Add(mappingNames[sourceName], sourceMember);
}
//如果不是只显式映射
if (!mappingSpecifiedOnly)
{
Dictionary<string, MemberInfo> sourceMembers = ConvertorGeneratorHelper.GetMembers(inputType);
foreach (string sourceName in sourceMembers.Keys)
{
if (!ignoreList.Contains(sourceName) && !distToSrc.ContainsKey(sourceName))
{
distToSrc.Add(sourceName, sourceName);
members.Add(sourceName, sourceMembers[sourceName]);
}
}
}
CodeGenerator gen = new CodeGenerator();
gen.BeginMethod("m" + Guid.NewGuid().ToString("N"), typeof(ConvertHandler));
ArgBuilder inputObjectArg = new ArgBuilder(0, inputType);
ArgBuilder outputObjectArg = new ArgBuilder(1, outputType);
int currentCount = 0;
int memberCount = members.Count;
string[] keys = new string[memberCount];
distToSrc.Keys.CopyTo(keys, 0);
List<string> keyList = new List<string>(keys);
MemberSetterGenerator.BeginSetMembers(gen, outputObjectArg);
//按排序顺序
while (currentCount < memberCount)
{
currentCount++;
string targetName = ConvertorGeneratorHelper.GetCurrentKey(mappingOrders, currentCount, keyList);
if (string.IsNullOrEmpty(targetName))
{
continue;
}
string sourceName = distToSrc[targetName];
if (MemberGetterGenerator.ContainsMember(sourceName, inputType, inputObject) && MemberSetterGenerator.ContainsMember(targetName, outputType, outputObject))
{
Type targetType = ConvertorGeneratorHelper.GetMemberType(members[targetName]);
LocalBuilder memberValue = gen.DeclareLocal(targetType, "memberValue");
MemberGetterGenerator.GetMemberValue(gen, inputObjectArg, sourceName, ref memberValue);
MemberSetterGenerator.SetMemberValue(gen, outputObjectArg, targetName, memberValue);
}
}
gen.Ldarg(outputObjectArg);
MemberSetterGenerator.EndSetMembers(gen, outputObjectArg);
return (ConvertHandler)gen.EndMethod();
}
