.net core 1.1.0 MVC 控制器接收Json字串 (JObject对象) (一)

.net core 1.1.0 MVC 控制器接收Json字串 (JObject对象) (二)

Json是WEB交互常见的数据,.net core 处理方式是转为强类型,没有对应的强类型会被抛弃,有时我们想自己在后台处理就想获得原始Json串,但.net core客户端的请求进行了默认的封装和转换。浏览器请求get,post,get不发Json,post发送请求有Form键值方式和Body数据方式,把键值对转成Json相对容易,这也是系列(一)的内容。

直接来思路,首先定义自己的ModelBinderProvider 如下:

 public class JObjectModelBinderProvider : IModelBinderProvider
{
public IModelBinder GetBinder(ModelBinderProviderContext context)
{
if (context == null) throw new ArgumentNullException(nameof(context));
if (context.Metadata.ModelType == (typeof(JObject)))
{
return new JObjectModelBinder(context.Metadata.ModelType);
}
return null;
}
}

接着编写对应的ModelBinder

public class JObjectModelBinder : IModelBinder
{
public JObjectModelBinder(Type type)
{
if (type == null)
{
throw new ArgumentNullException("type");
}
}
public Task BindModelAsync(ModelBindingContext bindingContext)
{
if (bindingContext == null) throw new ArgumentNullException("bindingContext");
ValueProviderResult result = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
try
{
JObject obj = new JObject();
if (bindingContext.ModelType == typeof(JObject))
{
foreach (var item in bindingContext.ActionContext.HttpContext.Request.Form)
{
obj.Add(new JProperty(item.Key.ToString(), item.Value.ToString()));
}
if ((obj.Count == 0))
{
bindingContext.ModelState.TryAddModelError(bindingContext.ModelName, bindingContext.ModelMetadata.ModelBindingMessageProvider.ValueMustNotBeNullAccessor(result.ToString()));
return Task.CompletedTask;
}
bindingContext.Result = (ModelBindingResult.Success(obj));
return Task.CompletedTask;
}
return Task.CompletedTask;
}
catch (Exception exception)
{
if (!(exception is FormatException) && (exception.InnerException != null))
{
exception = ExceptionDispatchInfo.Capture(exception.InnerException).SourceException;
}
bindingContext.ModelState.TryAddModelError(bindingContext.ModelName, exception, bindingContext.ModelMetadata);
return Task.CompletedTask;
}
}
}

最后将JObjectModelBinderProvider添加到Startup
            services.AddMvc(options =>
               {
                   options.ModelBinderProviders.Insert(0, new JObjectModelBinderProvider());//加入JobjectModelBinderProvider绑定
               });

使用
        [HttpPost]
        public IActionResult ComWizard(JObject data)
        {
            return new JsonResult(data);
        }
web端

$.post("/Home/ComWizard", { UserName: "Jerry", Password: "123" }, function (data) {
                 alert(data.userName + "--" + data.password);//这是以Form键值对方式提交的,非Json,但在控制器会认为是JObject
             });

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