Question

我正在尝试通过POST将参数从Angular客户端传递到c＃后端。我无法弄清楚为什么第二种方法失败时第一种方法失败了。在这两种情况下，传递给c＃的结果都不会转换回其类型吗？

英语

mixer.quit()

C＃端点失败

passwordResetRequest(email: string): Observable<string> {
    console.log('auth svc: ' + email)
    return this.http.post<string>("api/auth/forgotPassword", {email:email} ).pipe(
        catchError(this.handleError('error sending pwd reset request','error receiving response'))
    );
}

C＃端点工作

[HttpPost]
[AllowAnonymous]
[Route("forgotPassword")]
public async Task<IActionResult> ForgotPassword(JsonResult r){}//500 server error

//FAILS also
public async Task<IActionResult> ForgotPassword([FromBody] string r){}//r=null

Answer 1

我记得，ASP.NET WebAPI无法处理text/plain媒体类型，因此，如果仅发送该字符串，则端点将获得一个空字符串，则可以尝试在该字符串上设置其他Content-Type标头请求，或者，如果您想为text/plain内容类型添加支持，则可以遵循this tutorial.

public class PlainTextMediaTypeFormatter : MediaTypeFormatter
{
    public PlainTextMediaTypeFormatter()
    {
        SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/plain"));
    }

    public override Task<object> ReadFromStreamAsync(Type type, Stream readStream, HttpContent content, IFormatterLogger formatterLogger)
    {
        var source = new TaskCompletionSource<object>();

        try
        {
            using (var memoryStream = new MemoryStream())
            {
                readStream.CopyTo(memoryStream);
                var text = Encoding.UTF8.GetString(memoryStream.ToArray());
                source.SetResult(text);
            }
        }
        catch (Exception e)
        {
            source.SetException(e);
        }
        return source.Task;
    }

    public override Task WriteToStreamAsync(Type type, object value, Stream writeStream, HttpContent content, System.Net.TransportContext transportContext, System.Threading.CancellationToken cancellationToken)
    {
        var bytes = Encoding.UTF8.GetBytes(value.ToString());
        return writeStream.WriteAsync(bytes, 0, bytes.Length, cancellationToken);
    }

    public override bool CanReadType(Type type)
    {
        return type == typeof(string);
    }

    public override bool CanWriteType(Type type)
    {
        return type == typeof(string);
    }
}

然后可以将其添加到config.Formatters集合中：

public static class WebApiConfig
{
  public static void Register(HttpConfiguration http)
  {
    http.Formatters.Add(new PlainTextMediaTypeFormatter());
  }
}

从Angular传递到C＃端点的参数不是预期的类型

1 个答案: