/// <summary>
/// 嘗試取得相應的模型綁定器
/// </summary>
/// <param name="context">綁定內容</param>
/// <returns>模型綁定器實例</returns>
public IModelBinder GetBinder(ModelBinderProviderContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (context.Metadata.IsComplexType)
{
var propName = context.Metadata.PropertyName;
var propInfo = context.Metadata.ContainerType?.GetProperty(propName);
var attribute = propInfo
?.GetCustomAttributes(typeof(FromJsonAttribute), false)
?.FirstOrDefault();
// 直接將整個FormData綁定至單一複雜類型的參數上
if (propName != null && propInfo != null && attribute != null)
{
return(new MultipartJsonModelBinderProvider());
}
if (context?.Metadata?.BinderType?.GetCustomAttribute <FromJsonAttribute>() != null)
{
return(new MultipartJsonModelBinderProvider());
}
var visited = context.GetType().GetProperty("Visited", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public);
ControllerParameterDescriptor cpd = null;
foreach (var item in (IEnumerable)visited.GetValue(context))
{
var temp = item.GetType().GetProperty("Key").GetValue(item);
var tokenField = temp.GetType().GetField("_token", BindingFlags.Instance | BindingFlags.NonPublic);
cpd = tokenField.GetValue(temp) as ControllerParameterDescriptor;
if (cpd != null)
{
break;
}
}
if (cpd != null && cpd.ParameterInfo.GetCustomAttribute <FromJsonAttribute>() != null)
{
return(new MultipartJsonModelBinderProvider());
}
}
return(null);
}
