public ValueBindingResult BindObject(Type objType, string name, ValueProvider valueProvider, ModelBindingStateBuilder currentBindingStateBuilder)
{
var resolvedType = Nullable.GetUnderlyingType(objType) ??
objType;
var suffix = name;
string value = null;
while (!string.IsNullOrEmpty(suffix) && value == null)
{
value = valueProvider.GetValue(suffix);
suffix = string.Concat(suffix.SkipWhile(c => c != '.').Skip(1));
}
try
{
if (value == null)
{
throw new Exception();
}
if (resolvedType == typeof(object))
{
var result = JsonConvert.DeserializeObject(value, resolvedType);
return(new ValueBindingResult(true, result, resolvedType));
}
else
{
var result = Convert.ChangeType(value, resolvedType);
return(new ValueBindingResult(true, result, resolvedType));
}
}
catch
{
try
{
if (value == null)
{
throw new Exception();
}
if (resolvedType == typeof(object))
{
var result = Convert.ChangeType(value, resolvedType);
return(new ValueBindingResult(true, result, resolvedType));
}
else
{
var result = JsonConvert.DeserializeObject(value, resolvedType);
return(new ValueBindingResult(true, result, resolvedType));
}
}
catch
{
var ctor = resolvedType.GetConstructor(Type.EmptyTypes);
if (ctor == null)
{
return(new ValueBindingResult(false, null, resolvedType));
}
var result = Activator.CreateInstance(resolvedType);
var innerModelStateBuilder = new ModelBindingStateBuilder();
foreach (var f in resolvedType.GetFields().Where(f => f.IsPublic))
{
var obj = BindObject(f.FieldType, $"{name}.{f.Name}".ToLower(), valueProvider, innerModelStateBuilder);
if (obj.IsSuccessful)
{
innerModelStateBuilder.SetSucceeded(f.Name);
f.SetValue(result, obj.Result);
}
else
{
if (f.GetCustomAttribute <RequiredAttribute>() != null)
{
return(new ValueBindingResult(false, null, resolvedType));
}
innerModelStateBuilder.SetFailed(f.Name);
}
}
foreach (var p in resolvedType.GetProperties().Where(info => info.GetSetMethod() != null))
{
var obj = BindObject(p.PropertyType, $"{name}.{p.Name}".ToLower(), valueProvider, innerModelStateBuilder);
if (obj.IsSuccessful)
{
innerModelStateBuilder.SetSucceeded(p.Name);
p.SetValue(result, obj.Result);
}
else
{
if (p.GetCustomAttribute <RequiredAttribute>() != null)
{
return(new ValueBindingResult(false, null, resolvedType));
}
innerModelStateBuilder.SetFailed(p.Name);
}
}
var validateMethod = resolvedType.GetMethods().FirstOrDefault(method =>
method.GetCustomAttribute <ValidateMethodAttribute>() != null &&
method.GetParameters().SingleOrDefault() != null &&
method.GetParameters().SingleOrDefault().ParameterType == typeof(ModelBindingStateBuilder));
if (validateMethod != null)
{
validateMethod.Invoke(result, new object?[] { innerModelStateBuilder });
}
var innerModelState = innerModelStateBuilder.Build();
if (validateMethod != null)
{
if (validateMethod.GetCustomAttribute <RequiredAttribute>() != null &&
innerModelState.LocalFailsCount > 0)
{
return(new ValueBindingResult(false, null, resolvedType));
}
}
string lastSuffix = name.Substring(name.LastIndexOf('.') + 1);
currentBindingStateBuilder.AddState(lastSuffix, innerModelState);
return(new ValueBindingResult(true, result, resolvedType));
}
}
}
public object[] ActivateParameters(HttpContext context, MethodInfo actionMethod, ModelBindingStateBuilder stateBuilder)
{
object[] parameters = new object[actionMethod.GetParameters().Length];
var paramInfos = actionMethod.GetParameters();
var builder = new ValueProviderBuilder(context);
builder.Add <RouteValueProviderSource>();
builder.Add <QueryValueProviderSource>();
builder.Add <FormValueProviderSource>();
builder.Add <FormDataJsonValueProviderSource>();
var valueProvider = builder.Build();
foreach (var parameter in paramInfos)
{
var result = BindObject(parameter.ParameterType, parameter.Name.ToLower(), valueProvider, stateBuilder);
if (result.IsSuccessful)
{
parameters[parameter.Position] = result.Result;
stateBuilder.SetSucceeded(parameter.Name);
}
else
{
parameters[parameter.Position] = parameter.DefaultValue?.GetType() == typeof(DBNull)
? null
: parameter.DefaultValue;
stateBuilder.SetFailed(parameter.Name);
}
}
return(parameters);
}
