ASP.NET Web API调用时出现: 基础连接已经关闭: 发送时发生错误

Z时代
2024-01-10
分类：IT

以下是调用API的页面, 用的是Razor的写法, 我测试了一下是在执行Stream dataStream = client.OpenRead(GetURL); 这句话的时候报错的, 错误信息是"基础连接已经关闭: 发送时发生错误", 但是我单独打开API是没有问题的, API地址是: https://webapi20200813111324....{parameter}, 后面的{parameter}可以是任何字符串.

@using Newtonsoft.Json;
@{
    bool isConnectFailed = false;
    string errorInfo = "error";
    List<string> cards = new List<string>();
    var playerName = Request["PlayName"];
    if (IsPost)
    {
        string GetURL = "https://webapi20200813111324.azurewebsites.net/api/HandOfCards/" + playerName;
        WebClient client = new WebClient();
        try
        {
            Stream dataStream = client.OpenRead(GetURL);
            StreamReader reader = new StreamReader(dataStream);
            var results = JsonConvert.DeserializeObject<dynamic>(reader.ReadLine());
            reader.Close();
            foreach (var item in results)
            {
                cards.Add((string)item.imageLink);
            }
        }
        catch (System.Net.WebException e)
        {
            isConnectFailed = true;
            errorInfo = e.Message;
        }
    }
}
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8" />
    <style>
        body {
            font-family: Verdana;
            margin-left: 50px;
            margin-top: 50px;
        }
        div {
            border: 1px solid black;
            width: 800px;
            margin: 1.2em;
            padding: 1em;
        }
    </style>
    <title>BensCards: Deal yourself a hand.</title>
</head>
<body>
    @if (IsPost)
    {
        <label id="labelGoal">Which player has the best hand.</label>
        <br />
        <div>
            @if (isConnectFailed)
            {
                <p><label id="labelPlayer1">Web API Connection failed, Message: @errorInfo</label></p>
            }
            else
            {
                <p><label id="labelPlayer1">Player1: @playerName</label></p>
                foreach (string card in cards)
                {
                    <img width="75" height="100" alt="cardImage" src="https://deckofcards20200804.blob.core.windows.net/carddeck/@card" />
                }
            }
        </div>
        <label id="errorMessageLabel" />
    }
    else
    {
        <label id="labelGoal">
            Enter the players name and deal the cards.
        </label>
        <br /><br />
        <form method="post">
            <div>
                <p>Player 1: @Html.TextBox("PlayerName")</p>
                <p><input type="submit" value="Deal Cards" class="submit" /></p>
            </div>
        </form>
    }
</body></html>

以下是错误截图:

回答：

https://www.jianshu.com/p/370...

回答：

解决了,在13行前加入一行
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
即可.

@using Newtonsoft.Json;
@{
    bool isConnectFailed = false;
    string errorInfo = "error";
    List<string> cards = new List<string>();
    var playerName = Request["PlayerName"];
    if (IsPost)
    {
        ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12; //<--Add this line
        string GetURL = "https://webapi20200816050913.azurewebsites.net/api/handOfCards/" + playerName;
        WebClient client = new WebClient();
        try
        {
            Stream dataStream = client.OpenRead(GetURL);
            StreamReader reader = new StreamReader(dataStream);
            var results = JsonConvert.DeserializeObject<dynamic>(reader.ReadLine());
            reader.Close();
            foreach (var item in results)
            {
                cards.Add((string)item.imageLink);
            }
        }
        catch (System.Net.WebException e)
        {
            isConnectFailed = true;
            errorInfo = e.Message;
        }
    }
}
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8" />
    <style>
        body {
            font-family: Verdana;
            margin-left: 50px;
            margin-top: 50px;
        }
        div {
            border: 1px solid black;
            width: 800px;
            margin: 1.2em;
            padding: 1em;
        }
    </style>
    <title>BensCards: Deal yourself a hand.</title>
</head>
<body>
    @if (IsPost)
    {
        <label id="labelGoal">Which player has the best hand.</label>
        <br />
        <div>
            @if (isConnectFailed)
            {
                <p><label id="labelPlayer1">Web API Connection failed, Message: @errorInfo</label></p>
            }
            else
            {
                <p><label id="labelPlayer1">Player1: @playerName</label></p>
                foreach (string card in cards)
                {
                    <img width="75" height="100" alt="cardImage" src="https://deckofcards20200804.blob.core.windows.net/carddeck/@card" />
                }
            }
        </div>
        <label id="errorMessageLabel" />
    }
    else
    {
        <label id="labelGoal">
            Enter the players name and deal the cards.
        </label>
        <br /><br />
        <form method="post">
            <div>
                <p>Player 1: @Html.TextBox("PlayerName")</p>
                <p><input type="submit" value="Deal Cards" class="submit" /></p>
            </div>
        </form>
    }
</body></html>