private static void Parse(ILGenerator il, Type type)
{
if (type.GetTypeInfo().IsValueType)
{
//可空类型
if (EmitUtil.IsNullable(type))
{
var realType = EmitUtil.GetNullableArg0(type);
il.Emit(OpCodes.Call, realType.GetTypeInfo().GetMethod("Parse", new[] { typeof(string) }));
// ReSharper disable once AssignNullToNotNullAttribute
il.Emit(OpCodes.Newobj, type.GetTypeInfo().GetConstructor(new[] { realType }));
}
else
{
il.Emit(OpCodes.Call, type.GetTypeInfo().GetMethod("Parse", new[] { typeof(string) }));
}
}
}
private static LocalBuilder GetRealLocal(ILGenerator il, Type type, Dictionary <Type, LocalBuilder> realValueDict)
{
LocalBuilder localBuilder;
Type realType = type;
//可空类型或者Datetime类型,都需要将参数存储起来
if (EmitUtil.IsNullable(type))
{
realType = EmitUtil.GetNullableArg0(type);
}
if (realValueDict.ContainsKey(realType))
{
localBuilder = realValueDict[realType];
}
else
{
localBuilder = il.DeclareLocal(realType);
realValueDict.Add(realType, localBuilder);
}
return(localBuilder);
}
private static void PropertyToString(ILGenerator il, Type type, Dictionary <Type, LocalBuilder> valueDict)
{
//值类型和可空类型
if (type.GetTypeInfo().IsValueType)
{
//不可空类型,直接创建新的,可空类型就先从字典中取,取不到再新建
var localBuilder = GetLocal(il, type, valueDict);
il.Emit(OpCodes.Stloc_S, localBuilder);
il.Emit(OpCodes.Ldloca_S, localBuilder);
if (type == typeof(DateTime) || type == typeof(DateTime?))
{
//可空datetime类型
if (type == typeof(DateTime?))
{
il.Emit(OpCodes.Call, type.GetTypeInfo().GetMethod("get_Value", new Type[] { }));
var realLocal = GetRealLocal(il, type, valueDict);
il.Emit(OpCodes.Stloc_S, realLocal);
il.Emit(OpCodes.Ldloca_S, realLocal);
}
il.Emit(OpCodes.Call, CultureInfo);
il.Emit(OpCodes.Call, DatetimeToString);
}
else
{
if (EmitUtil.IsNullable(type))
{
il.Emit(OpCodes.Call, type.GetTypeInfo().GetMethod("get_Value", new Type[] { }));
var realLocal = GetRealLocal(il, type, valueDict);
il.Emit(OpCodes.Stloc_S, realLocal);
il.Emit(OpCodes.Ldloca_S, realLocal);
}
il.Emit(OpCodes.Call, EmitUtil.GetNullableArg0(type).GetTypeInfo().GetMethod("ToString", new Type[] { }));
}
}
}
/// <summary>获取将对象转换成字典类型的委托
/// </summary>
public static Func <T, Dictionary <string, string> > GetDictionaryFunc <T>()
{
if (typeof(ICollection).GetTypeInfo().IsAssignableFrom(typeof(T)))
{
throw new NotSupportedException("Not support type: ICollection");
}
var type = typeof(Dictionary <string, string>);
var properties = PropertyInfoUtil.GetProperties(typeof(T));
DynamicMethod dynamicMethod = new DynamicMethod("ObjectToDictionary", type,
new Type[] { typeof(T) }, typeof(object), true)
{
InitLocals = true
};
ILGenerator il = dynamicMethod.GetILGenerator();
//结束标签
Label endLabel = il.DefineLabel();
//定义变量 var user=new User();他为第0个变量
LocalBuilder obj = il.DeclareLocal(type);
//定义了可空类型的变量集合
Dictionary <Type, LocalBuilder> valueDict = new Dictionary <Type, LocalBuilder>();
// ReSharper disable once AssignNullToNotNullAttribute
il.Emit(OpCodes.Newobj, type.GetTypeInfo().GetConstructor(Type.EmptyTypes));
il.Emit(OpCodes.Stloc, obj);
int index = 0;
foreach (var property in properties)
{
Label endIfLabel = il.DefineLabel();
//string,可空类型需要null判断
if (property.PropertyType == typeof(string))
{
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Callvirt, property.GetGetMethod());
il.Emit(OpCodes.Ldnull);
il.Emit(OpCodes.Cgt_Un);
var tmp = il.DeclareLocal(typeof(bool));
il.Emit(OpCodes.Stloc, tmp);
il.Emit(OpCodes.Ldloc, tmp);
il.Emit(OpCodes.Brfalse_S, endIfLabel);
}
//可空类型
if (EmitUtil.IsNullable(property.PropertyType))
{
var hasValue = il.DeclareLocal(typeof(bool));
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Callvirt, property.GetGetMethod());
var local = GetLocal(il, property.PropertyType, valueDict);
il.Emit(OpCodes.Stloc_S, local);
il.Emit(OpCodes.Ldloca_S, local);
il.Emit(OpCodes.Call, property.PropertyType.GetTypeInfo().GetMethod("get_HasValue", new Type[] { }));
if (index == 0)
{
il.Emit(OpCodes.Stloc, hasValue);
il.Emit(OpCodes.Ldloc, hasValue);
}
else
{
il.Emit(OpCodes.Stloc_S, hasValue);
il.Emit(OpCodes.Ldloc_S, hasValue);
}
index++;
il.Emit(OpCodes.Brfalse_S, endIfLabel);
}
il.Emit(OpCodes.Ldloc, obj);
il.Emit(OpCodes.Ldstr, property.Name);
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Callvirt, property.GetGetMethod()); //取对象属性值
PropertyToString(il, property.PropertyType, valueDict);
il.Emit(OpCodes.Callvirt, DictionaryAddItem);
il.MarkLabel(endIfLabel);
}
var result = il.DeclareLocal(type);
il.Emit(OpCodes.Ldloc, obj);
il.Emit(OpCodes.Stloc_S, result);
il.Emit(OpCodes.Br_S, endLabel);
il.MarkLabel(endLabel);
il.Emit(OpCodes.Ldloc_S, result);
il.Emit(OpCodes.Ret);
var func =
dynamicMethod.CreateDelegate(typeof(Func <T, Dictionary <string, string> >)) as Func <T, Dictionary <string, string> >;
if (func == null)
{
throw new VerificationException();
}
return(func);
}