Question

当我在不等待的情况下使用httpclient调用异步方法时，我不想等待响应然后抛出异常“对象引用未设置为对象的实例”

\\ Call PostAsync
var ignore = webRequest.PostAsync(json, token);

\\ PostAsync method
using (var httpClient = new HttpClient())
{
    if (!string.IsNullOrEmpty(auth))
        httpClient.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", auth);

    var content = new StringContent(json, Encoding.UTF8, "application/json");   
    // this line throw exception
    var response = await httpClient.PostAsync(this.URL, content);
    if (response.IsSuccessStatusCode)
    {
        result = await response.Content.ReadAsStringAsync();
    }                    
}

然后我在下面的Visual Studio图像上出现错误。

image

如果我不想等待响应，我该怎么办？

Answer 1

我认为问题是异步等待的基本概念，请查看此链接以了解更清晰的想法：

https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/concepts/async/

调用异步方法HttpClient而不等待抛出错误

1 个答案: