将WebClient.UploadString()替换为HttpClient.PostAsync

Question

我想在代码中将WebClient替换为HttpClient。我必须在HttpClient中使用什么HttpClient来替换WebClient.UploadString？我的WebClient代码：

string data = string.Format("name={0}&warehouse={1}&address={2}", name, shop.Warehouse.Id, shop.Address);

using (var wc = new WebClient()) {
    wc.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";
    wc.Encoding = Encoding.UTF8;

    string fullUrl = BaseUrl + url;
    string response = wc.UploadString(fullUrl, data);
    // ...
}

Answer 1

您可以构造您的postdata并在FormUrlEncodedContent实例中使用它，如下所示：

// This is the postdata
var data = new List<KeyValuePair<string, string>>();
data.Add(new KeyValuePair<string, string>("Name", "test"));

HttpContent content = new FormUrlEncodedContent(data);

本页中指定了一些解决方案：

How to use System.Net.HttpClient to post a complex type?

您可以决定异步或同步地提交它，例如：

HttpResponseMessage x = await httpClient.PostAsync(fullUrl, content);

Answer 2

您也可以替换

string payload = System.IO.File.ReadAllText("e:\\IIF-Input3 (1).xml");
        try
        {
            System.Net.WebClient client = new System.Net.WebClient();
            client.Encoding = Encoding.UTF8;
            string res = client.UploadString("http://1.2.3.4:80/RunJson?name=Test", "POST", payload);
        }
        catch (System.Exception ex)
        {
            MessageBox.Show(ex.Message);
        }

使用

string payload = System.IO.File.ReadAllText("e:\\IIF-Input3 (1).xml");
var content = new System.Net.Http.StringContent(payload, System.Text.Encoding.UTF8, "application/x-www-form-urlencoded");
        var httpClient = new System.Net.Http.HttpClient();
        httpClient.BaseAddress = new Uri("http://1.2.3.4:80/");
        System.Net.Http.HttpResponseMessage response = httpClient.PostAsync("/RunJson?name=Test", content).Result;

        string result = response.Content.ReadAsStringAsync().Result;