[英]HttpClient PostAsync method throw Aggregate Exception
I would like to use the http client class to call an api controller method and the PostAsync method has thrown an Aggregate Exception. 我想使用http客户端类调用api控制器方法,而PostAsync方法引发了Aggregate Exception。 I tried to write an async method what call the PostAsync and try the ContinueWith method but no one of them work. 我试图编写一个称为PostAsync的异步方法,然后尝试ContinueWith方法,但是没有一个起作用。 Here is the code: 这是代码:
class Program
{
private const string apiPath = @"http://localhost:51140";
private const string param = "/Home/savedocumenttoPath?folderPath=string";
static void Main(string[] args)
{
HttpClient client = new HttpClient();
client.BaseAddress = new Uri(apiPath);
// Add an Accept header for JSON format.
client.DefaultRequestHeaders.Accept.Add(
new MediaTypeWithQualityHeaderValue("application/json"));
HttpResponseMessage response = getBack(client);
Console.WriteLine("{0} ({1})", (int)response.StatusCode, response.ReasonPhrase);
client.Dispose();
Console.ReadLine();
}
public static HttpResponseMessage getBack(HttpClient client)
{
return client.PostAsync(client.BaseAddress + param, null).GetAwaiter().GetResult();
}
}
And here is the controller what I want to call:(I tried JsonResult but that also not work) 这是我要调用的控制器:(我尝试了JsonResult,但也无法正常工作)
[HttpPost]
public ActionResult saveDocumentToPath(string folderPath)
{
try
{
if (string.IsNullOrWhiteSpace(folderPath)) throw new NullReferenceException("Invalid Folder!");
var fullPath = folderPath + "\\";
if (!System.IO.Directory.Exists(fullPath))
{
return new HttpStatusCodeResult(HttpStatusCode.OK, "The specified directory not exists: \n" + fullPath);
}
var fileName = "ProjectList_Excel_" + DateTime.Now.Year + DateTime.Now.Month + DateTime.Now.Day;
var filePathName = fullPath + fileName;
if (System.IO.File.Exists(filePathName))
{
return new HttpStatusCodeResult(HttpStatusCode.OK, "The specified file already exists in the folder: \n" + fileName);
}
System.IO.File.WriteAllBytes(filePathName, BL.ExcelExport.GetProjectListExcel());
return new HttpStatusCodeResult(HttpStatusCode.OK, "File Exported successfully!");
}
catch (Exception e)
{
return new HttpStatusCodeResult(HttpStatusCode.OK, "Error occured while saving the file" + e.Message);
}
}
You could modify your getBack
method like this. 您可以像这样修改getBack
方法。 Since your endpoint is expecting parameters that are simple types (eg string or int), you need to wrap it in a FormUrlEncodedContent
. 由于端点期望的参数是简单类型(例如,字符串或整数),因此需要将其包装在FormUrlEncodedContent
。 The folderPath key in the Dictionary<string, string>
corresponds with the name of the parameter of the endpoint. Dictionary<string, string>
的folderPath键与端点参数的名称相对应。
public static HttpResponseMessage getBack(HttpClient client)
{
var values = new Dictionary<string, string>
{
{ "folderPath", @"C:\Temp" }
};
var content = new FormUrlEncodedContent(values);
return client.PostAsync("Home/saveDocumentToPath", content).GetAwaiter().GetResult();
}
You won't even need the client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
您甚至不需要client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
in your client, since you're not posting json. 在您的客户端中,因为您没有发布json。
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