具有PostAsync代碼優化的HttpClient

Question

我正在使用下面的代碼，代碼工作正常。 我是HTTPClient的新手，所以我不確定此代碼是否經過適當優化，或者最好的編碼方式是什么。 我發現了這個示例，盡管它涉及的是並行編程，但該示例仍在討論死鎖，但是我只是想確保是否可以針對性能或錯誤來改進/優化此代碼。

我使用特定的關鍵參數連接到網站並獲取返回的json數據。 ii。采取進一步行動的過程。

protected void btnClient_Click(object sender, EventArgs e)
    {
        using (var client = new HttpClient())
        {

            client.BaseAddress = new Uri("https://secure.telr.com/");
            client.DefaultRequestHeaders.ExpectContinue = false;
            var result = client.PostAsync("gateway/order.json",
                new FormUrlEncodedContent(new List<KeyValuePair<string, string>>()
            {
                new KeyValuePair<string, string>("ivp_method", "create"),
                new KeyValuePair<string, string>("ivp_store", "12345"),
                new KeyValuePair<string, string>("ivp_authkey", "xxx-xxxxxx"),
                new KeyValuePair<string, string>("ivp_cart", "123452"),
                new KeyValuePair<string, string>("ivp_desc", "Descripion"),
                new KeyValuePair<string, string>("ivp_test", "1"),
                new KeyValuePair<string, string>("ivp_amount", "10.00"),
                new KeyValuePair<string, string>("ivp_currency", "UAD"),
                new KeyValuePair<string, string>("return_auth", "http://localhost:1044/Test2.aspx"),
                new KeyValuePair<string, string>("return_can", "http://localhost:1044/Test2.aspx"),
                new KeyValuePair<string, string>("return_decl", "http://localhost:1044/Test2.aspx"),
                new KeyValuePair<string, string>("ivp_framed", "1"),
            })).Result;


            var jsonData = (JObject)JsonConvert.DeserializeObject(result.Content.ReadAsStringAsync().Result);

            dynamic jObj = JsonConvert.DeserializeObject(result.Content.ReadAsStringAsync().Result);

            string url = jsonData["order"]["url"].ToString();
            Response.Write("<br>url" + url + "<br>");

            ltrTelr.Text = "<iframe id= 'telr' src='" + url + "' ></iframe>";

        }
    }

Answer 1

當您不確定API是否/何時返回數據時，應避免嘗試訪問Task.Result。 那會阻塞您的線程，因為它正在嘗試評估結果。

相反，在調用異步方法時，應使用“ await”關鍵字，以便釋放線程，如下所示：

protected async Task btnClient_Click(object sender, EventArgs e)
{
    using (var client = new HttpClient())
    {

        client.BaseAddress = new Uri("https://secure.telr.com/");
        client.DefaultRequestHeaders.ExpectContinue = false;
        var result = await client.PostAsync("gateway/order.json",
            new FormUrlEncodedContent(new List<KeyValuePair<string, string>>()
        {
            new KeyValuePair<string, string>("ivp_method", "create"),
            new KeyValuePair<string, string>("ivp_store", "12345"),
            new KeyValuePair<string, string>("ivp_authkey", "xxx-xxxxxx"),
            new KeyValuePair<string, string>("ivp_cart", "123452"),
            new KeyValuePair<string, string>("ivp_desc", "Descripion"),
            new KeyValuePair<string, string>("ivp_test", "1"),
            new KeyValuePair<string, string>("ivp_amount", "10.00"),
            new KeyValuePair<string, string>("ivp_currency", "UAD"),
            new KeyValuePair<string, string>("return_auth", "http://localhost:1044/Test2.aspx"),
            new KeyValuePair<string, string>("return_can", "http://localhost:1044/Test2.aspx"),
            new KeyValuePair<string, string>("return_decl", "http://localhost:1044/Test2.aspx"),
            new KeyValuePair<string, string>("ivp_framed", "1"),
        }));

        var rawData = await result.Content.ReadAsStringAsync();

        var jsonData = (JObject)JsonConvert.DeserializeObject(rawData);
        dynamic jObj = JsonConvert.DeserializeObject(rawData);

        string url = jsonData["order"]["url"].ToString();
        Response.Write("<br>url" + url + "<br>");

        ltrTelr.Text = "<iframe id= 'telr' src='" + url + "' ></iframe>";

    }
}