在VS 2013 for Web中，需要在按钮单击时将URL发送到Web服务。 [英] In VS 2013 for Web, need to send a URL on button click to a web service.

问题描述

我在远程服务器上有一个web服务，当使用Web浏览器将此URL发送到远程服务器时，它会将硬件I / O端口的状态更改为ON： http：//agratek.dyndns ？。组织：8080 / web服务OP = Actuate的&安培;节点ID = 2及端口ID = 0&安培;值= ON 的。我需要在ASP.NET网页上添加一个按钮来执行相同的操作。



我在Visual Studio for Web 2013 .aspx webform文件中的代码创建了按钮：



< asp：Button ID =butValveONrunat =serverOnClick =butValveON_ClickText =Valve ON/>



这在代码隐藏.cs文件中处理按钮点击事件：

I have a webservice on a remote server that changes the state of a hardware I/O port to 'ON' when this URL is sent to the remote server using a web browser: http://agratek.dyndns.org:8080/webservice?Op=Actuate&NodeID=2&PortID=0&Value=ON. I need to add a button to an ASP.NET web page that does the same thing.

My code in the Visual Studio for Web 2013 .aspx webform file creates the button:

<asp:Button ID="butValveON" runat="server" OnClick="butValveON_Click" Text="Valve ON" />

And this in the code-behind .cs file handles the button click event:

protected void butValveON_Click(object sender, EventArgs e)
{
    //Send the URL to remote server, wait for and capture response
}

我想等待并捕获webservice对命令的OK响应。有人可以建议一种方法或更好，一个代码片段来做到这一点吗？如果您想尝试，网络服务现在正在运行..它将返回[确定]

I would like to wait for and capture the webservice's "OK" response to the command. Can someone suggest an approach or better, a code fragment to do this please? The webservice is running now if you would like to try it..it will return [ "OK" ]

推荐答案

使用WebClient的示例

sample using WebClient

string url ="http://agratek.dyndns.org:8080/webservice?Op=Actuate&NodeID=2&PortID=0&Value=ON";
System.Net.WebClient myWebClient = new System.Net.WebClient();
Stream myStream = myWebClient.OpenRead(url);
StreamReader sr = new StreamReader(myStream);
string returnData = sr.ReadToEnd(); // check for OK
myStream.Close();

我提出了这个有效的解决方案。该按钮在.aspx文件中定义：

I came up with this solution that works. The button is defined in the .aspx file:

<asp:button id="butValve0_ON" runat="server" onclick="butValve0_ON_Click" text="Valve 0 ON" width="105px" height="25px" xmlns:asp="#unknown" />

此解决方案会刷新整个页面，但它始终有效。应该为此解决方案添加一些错误和无响应检查。当WebService以OK响应时，将更新TextBox。

This solution causes the whole page to be refreshed, but it always works. One should add some error and no-response checking to this solution. A TextBox is updated when the WebService responds with "OK".

<pre>        protected void butValve0_ON_Click(object sender, EventArgs e)
        {
            //Send the URL to remote server, wait for and capture response
            Uri myUri = new Uri("http://agratek.dyndns.org:8080/webservice?Op=Actuate&NodeID=2&PortID=0&Value=ON");
            System.Net.WebClient myWebClient = new System.Net.WebClient();
            Stream myStream = myWebClient.OpenRead(myUri);
            StreamReader sr = new StreamReader(myStream);
            string returnData = sr.ReadToEnd(); // check for OK
            tbValve0State.Text = returnData;
            myStream.Close();

            if ( returnData.Contains("OK") )
            {
                tbValve0State.Text = "ON";
                tbValve0State.BackColor = System.Drawing.Color.LightGreen;
            }

        }

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