/// <summary>
/// 这里有个问题是：如果不修改类的名字，则重新创建时会出现同名程序集则不能创建，所以有任何更新都必须更新类名。但是更新了类名就无法做到数据迁移
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
/// <returns></returns>
public static bool CompareRuntimeMeta(RuntimeModelMeta a, RuntimeModelMeta b)
{
if (a.ModelId != b.ModelId)
{
return(false);
}
if (a.ModelName != b.ModelName)
{
return(false);
}
if (a.ClassName != b.ClassName)
{
return(false);
}
if (a.ModelProperties.Length != b.ModelProperties.Length)
{
return(false);
}
for (int Count = 0; Count < a.ModelProperties.Length; Count++)
{
bool Isthere = false;
for (int num = 0; num < b.ModelProperties.Length; num++)
{
if (a.ModelProperties[Count].Name != b.ModelProperties[Count].Name)
{
break;
}
if (a.ModelProperties[Count].PropertyName != b.ModelProperties[Count].PropertyName)
{
break;
}
if (a.ModelProperties[Count].Length != b.ModelProperties[Count].Length)
{
break;
}
if (a.ModelProperties[Count].IsRequired != b.ModelProperties[Count].IsRequired)
{
break;
}
if (a.ModelProperties[Count].ValueType != b.ModelProperties[Count].ValueType)
{
break;
}
Isthere = true;
}
if (Isthere == false)
{
return(false);
}
}
return(true);
}
public static IRuntimeModelProvider CreateInstance(string strjson)
{
RuntimeModelMeta Temp = Newtonsoft.Json.JsonConvert.DeserializeObject <RuntimeModelMeta>(strjson);
if (_instance == null || !CompareRuntimeMeta(Temp, TempCache))
{
TempCache = Temp;
lock (lockHelper)
{
_instance = new DefaultRuntimeModelProvider(new RuntimeModelMetaConfig()
{
Metas = new RuntimeModelMeta[] { TempCache }
});
}
}
return(_instance);
}
//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);
}