[英]MVC and fail AJAX call
I have a controller method: 我有一个控制器方法:
public async Task SaveRouting(string points, int tripId, decimal totalMileage)
{
if (Request.IsAjaxRequest())
{
//....
await _serviceTrip.UpdateTotalMileageAsync(tripId, totalMileage);
}
else
throw new Exception("Only ajax calls are allowed");
}
so, as we can see, this method returns Task, so nothing to client. 因此,正如我们所看到的,此方法返回Task,因此对客户端没有任何影响。 But if something wrong (ie totalMileage is less or equal 0) I want to return 422 status code and dictionary with invalid data, like: { "totalMileage" : "Total mileage should be greater than 0" } 但是,如果出现问题(例如totalMileage小于或等于0),我想返回422状态代码和带有无效数据的字典,例如:{“” totalMileage“:”总里程数应大于0“}
How to do it? 怎么做? I try to do it: 我尝试这样做:
if (totalMileage <= 0)
{
Response.StatusCode = 422; // 422 Unprocessable Entity Explained
}
but how to describe an error? 但是如何描述一个错误呢?
If you want to describe the error after setting Response.StatusCode
, then you have to write into the body of the http response by calling Response.Body.Write(byte[],int, int)
. 如果要在设置Response.StatusCode
之后描述错误,则必须通过调用Response.Body.Write(byte[],int, int)
写入http响应的正文。 Therefore, you can convert your response message to a byte array using the following method: 因此,可以使用以下方法将响应消息转换为字节数组:
public byte[] ConvertStringToArray(string s)
{
return new UTF8Encoding().GetBytes(s);
}
And then use it like this: 然后像这样使用它:
byte[] bytes = ConvertStringToArray("Total mileage should be greater than 0");
Response.StatusCode = 422;
Response.Body.Write(bytes,0,bytes.Length);
But you can further simplify this using extension methods on ControllerBase
但是您可以使用ControllerBase
扩展方法进一步简化此操作
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