private static void AddProperty(TypeMeta.TypePropertyMeta property, TypeBuilder builder, Type baseType)
{
PropertyBuilder propertyBuilder = builder.DefineProperty(property.PropertyName, PropertyAttributes.None, property.PropertyType, null);
foreach (var item in property.AttributeMetas)
{
if (item.ConstructorArgTypes == null)
{
item.ConstructorArgTypes = new Type[0];
item.ConstructorArgValues = new object[0];
}
ConstructorInfo cInfo = item.AttributeType.GetConstructor(item.ConstructorArgTypes);
PropertyInfo[] pInfos = item.Properties.Select(m => item.AttributeType.GetProperty(m)).ToArray();
CustomAttributeBuilder aBuilder = new CustomAttributeBuilder(cInfo, item.ConstructorArgValues, pInfos, item.PropertyValues);
propertyBuilder.SetCustomAttribute(aBuilder);
}
MethodAttributes attributes = MethodAttributes.SpecialName | MethodAttributes.HideBySig | MethodAttributes.Public;
MethodBuilder getMethodBuilder = builder.DefineMethod("get_" + property.PropertyName, attributes, property.PropertyType, Type.EmptyTypes);
ILGenerator iLGenerator = getMethodBuilder.GetILGenerator();
MethodInfo getMethod = baseType.GetMethod("GetValue").MakeGenericMethod(new Type[] { property.PropertyType });
iLGenerator.DeclareLocal(property.PropertyType);
iLGenerator.Emit(OpCodes.Nop);
iLGenerator.Emit(OpCodes.Ldarg_0);
iLGenerator.Emit(OpCodes.Ldstr, property.PropertyName);
iLGenerator.EmitCall(OpCodes.Call, getMethod, null);
iLGenerator.Emit(OpCodes.Stloc_0);
iLGenerator.Emit(OpCodes.Ldloc_0);
iLGenerator.Emit(OpCodes.Ret);
MethodInfo setMethod = baseType.GetMethod("SetValue").MakeGenericMethod(new Type[] { property.PropertyType });
MethodBuilder setMethodBuilder = builder.DefineMethod("set_" + property.PropertyName, attributes, null, new Type[] { property.PropertyType });
ILGenerator generator2 = setMethodBuilder.GetILGenerator();
generator2.Emit(OpCodes.Nop);
generator2.Emit(OpCodes.Ldarg_0);
generator2.Emit(OpCodes.Ldstr, property.PropertyName);
generator2.Emit(OpCodes.Ldarg_1);
generator2.EmitCall(OpCodes.Call, setMethod, null);
generator2.Emit(OpCodes.Nop);
generator2.Emit(OpCodes.Ret);
propertyBuilder.SetGetMethod(getMethodBuilder);
propertyBuilder.SetSetMethod(setMethodBuilder);
}
//这个方法就是把一个RuntimeModelMeta转换成更接近类结构的TypeMeta对象
private TypeMeta GetTypeMetaFromModelMeta(RuntimeModelMeta meta)
{
TypeMeta typeMeta = new TypeMeta();
//我们让所有的动态类型都继承自DynamicEntity类，这个类主要是为了方便属性数据的读取，具体代码看后面
typeMeta.BaseType = typeof(DynamicEntity);
typeMeta.TypeName = meta.ClassName;
foreach (var item in meta.ModelProperties)
{
TypeMeta.TypePropertyMeta pmeta = new TypeMeta.TypePropertyMeta();
pmeta.PropertyName = item.PropertyName;
//如果必须输入数据，我们在属性上增加RequireAttribute特性，这样方便我们进行数据验证
if (item.IsRequired)
{
TypeMeta.AttributeMeta am = new TypeMeta.AttributeMeta();
am.AttributeType = typeof(RequiredAttribute);
am.Properties = new string[] { "ErrorMessage" };
am.PropertyValues = new object[] { "请输入" + item.Name };
pmeta.AttributeMetas.Add(am);
}
if (item.ValueType == "string")
{
pmeta.PropertyType = typeof(string);
TypeMeta.AttributeMeta am = new TypeMeta.AttributeMeta();
//增加长度验证特性
am.AttributeType = typeof(StringLengthAttribute);
am.ConstructorArgTypes = new Type[] { typeof(int) };
am.ConstructorArgValues = new object[] { item.Length };
am.Properties = new string[] { "ErrorMessage" };
am.PropertyValues = new object[] { item.Name + "长度不能超过" + item.Length.ToString() + "个字符" };
pmeta.AttributeMetas.Add(am);
}
else if (item.ValueType == "int")
{
if (!item.IsRequired)
{
pmeta.PropertyType = typeof(int?);
}
else
{
pmeta.PropertyType = typeof(int);
}
}
else if (item.ValueType == "datetime")
{
if (!item.IsRequired)
{
pmeta.PropertyType = typeof(DateTime?);
}
else
{
pmeta.PropertyType = typeof(DateTime);
}
}
else if (item.ValueType == "bool")
{
if (!item.IsRequired)
{
pmeta.PropertyType = typeof(bool?);
}
else
{
pmeta.PropertyType = typeof(bool);
}
}
typeMeta.PropertyMetas.Add(pmeta);
}
return(typeMeta);
}