private static string GetRawValue(Controller controller, ActionParameterMethod method, string name)
{
switch (method)
{
case ActionParameterMethod.Query: return(controller.Request.QueryString[name]);
case ActionParameterMethod.Form: return(controller.HasFormData ? controller.GetFormData()[name] : null);
case ActionParameterMethod.Body: return(controller.HasEntityBody ? controller.GetEntityBodyString() : null);
case ActionParameterMethod.Url: return(controller.UrlSegments[name]);
default: return(null);
}
}
private static Expression GenerateParameterParser(ParameterInfo param, ActionParameterMethod paramMethod, Expression controllerParam)
{
var methodAttrib = param.GetCustomAttribute <ActionParameterAttribute>();
if (methodAttrib != null)
{
paramMethod = methodAttrib.Method;
}
var type = param.ParameterType;
var methodName = $"Read{type.Name}";
const BindingFlags flags = BindingFlags.Static | BindingFlags.Public;
var method = typeof(ParameterParsers).GetMethod(methodName, flags);
if (method == null)
{
var bodyAttrib = methodAttrib as BodyAttribute;
if (bodyAttrib == null || !bodyAttrib.Json)
{
throw new NotImplementedException();
}
method = typeof(ParameterParsers).GetMethod("ReadJson", flags);
method = method.MakeGenericMethod(param.ParameterType);
}
var @default = param.HasDefaultValue ? param.DefaultValue
: type.IsValueType ? Activator.CreateInstance(type) : null;
var methodConst = Expression.Constant(paramMethod);
var nameConst = Expression.Constant(param.Name);
var defaultConst = Expression.Constant(@default, type);
Expression call = Expression.Call(method, controllerParam, methodConst, nameConst, defaultConst);
if (method.ReturnType != param.ParameterType)
{
call = Expression.Convert(call, param.ParameterType);
}
return(call);
}
public static double ReadDouble(Controller controller, ActionParameterMethod method, string name, double @default)
{
double value;
return(double.TryParse(GetRawValue(controller, method, name), out value) ? value : @default);
}
public static float ReadSingle(Controller controller, ActionParameterMethod method, string name, float @default)
{
float value;
return(float.TryParse(GetRawValue(controller, method, name), out value) ? value : @default);
}
public static bool ReadBoolean(Controller controller, ActionParameterMethod method, string name, bool @default)
{
bool value;
return(bool.TryParse(GetRawValue(controller, method, name), out value) ? value : @default);
}
public static long ReadInt64(Controller controller, ActionParameterMethod method, string name, long @default)
{
long value;
return(long.TryParse(GetRawValue(controller, method, name), out value) ? value : @default);
}
public static int ReadInt32(Controller controller, ActionParameterMethod method, string name, int @default)
{
int value;
return(int.TryParse(GetRawValue(controller, method, name), out value) ? value : @default);
}
public static string ReadString(Controller controller, ActionParameterMethod method, string name, string @default)
{
return(GetRawValue(controller, method, name) ?? @default);
}
public static object ReadJson <T>(Controller controller, ActionParameterMethod method, string name, T @default)
{
var str = GetRawValue(controller, method, name);
return(!string.IsNullOrEmpty(str) ? JsonConvert.DeserializeObject(str, typeof(T)) : @default);
}
public static JArray ReadJArray(Controller controller, ActionParameterMethod method, string name, JArray @default)
{
var str = GetRawValue(controller, method, name);
return(!string.IsNullOrEmpty(str) ? JArray.Parse(str) : @default);
}
internal ActionParameterAttribute(ActionParameterMethod method)
{
Method = method;
}
