输入cmd命令，显示结果到richtextbox c#

Question

我在向 richtextbox 显示 cmd 命令的结果时遇到了问题。到目前为止，我有这个代码：

private void richTextBox2_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Enter)
        {
            e.Handled = true;
            e.SuppressKeyPress = true;
                ProcessStartInfo cmdStartInfo = new ProcessStartInfo();
                cmdStartInfo.FileName = @"C:\Windows\System32\cmd.exe";
                cmdStartInfo.RedirectStandardOutput = true;
                cmdStartInfo.RedirectStandardError = true;
                cmdStartInfo.RedirectStandardInput = true;
                cmdStartInfo.UseShellExecute = false;
                cmdStartInfo.CreateNoWindow = true;

                Process cmdProcess = new Process();
                cmdProcess.StartInfo = cmdStartInfo;
                cmdProcess.OutputDataReceived += cmd_DataReceived;
                cmdProcess.EnableRaisingEvents = true;
                cmdProcess.Start();
                cmdProcess.BeginOutputReadLine();
                cmdProcess.BeginErrorReadLine();

                cmdProcess.StandardInput.WriteLine(richTextBox2.Text);     
                cmdProcess.StandardInput.WriteLine("exit");                  

                cmdProcess.WaitForExit();

                richTextBox1.Text = richTextBox1.Text + cmd_DataReceived + Environment.NewLine;

        }
    }

static void cmd_DataReceived(object sender, DataReceivedEventArgs e)
    {
        Console.WriteLine("Output from other process");
        Console.WriteLine(e.Data);
    }

我试过用 "richTextBox1.Text = richTextBox1.Text + (e.Data);" 替换 "Console.WriteLine(e.Data);" 但它不会被接受。我也试过 "richTextBox1.Text = richTextBox1.Text + cmd_DataReceived"; 但这没有用。然后我尝试用 messagebox.show(e.data) 替换 console.writeline 但又一次..不命令有效，但不会显示

我知道我复制了大部分代码，它可能适用于控制台应用程序。

请帮忙

Answer 1

当您等待进程以 cmdProcess.WaitForExit 退出时，cmd_DataReceived 正在获取所有数据。这意味着您将需要存储从回调中获得的数据，并且在 WaitForExit 结束后，您可以使用存储数据的内容设置文本框。

一个简单的方法是使用 StringBuilder:

    // Have a reference to a stringbuilder that both functions can see
    StringBuilder m_output;

    private void richTextBox2_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Enter)
        {
            // Before the process starts, create a new stringbuilder
            m_output = new StringBuilder();

            e.Handled = true;
            e.SuppressKeyPress = true;
            ProcessStartInfo cmdStartInfo = new ProcessStartInfo();
            cmdStartInfo.FileName = @"C:\Windows\System32\cmd.exe";
            cmdStartInfo.RedirectStandardOutput = true;
            cmdStartInfo.RedirectStandardError = true;
            cmdStartInfo.RedirectStandardInput = true;
            cmdStartInfo.UseShellExecute = false;
            cmdStartInfo.CreateNoWindow = true;

            Process cmdProcess = new Process();
            cmdProcess.StartInfo = cmdStartInfo;
            cmdProcess.OutputDataReceived += cmd_DataReceived;
            cmdProcess.EnableRaisingEvents = true;
            cmdProcess.Start();
            cmdProcess.BeginOutputReadLine();
            cmdProcess.BeginErrorReadLine();

            cmdProcess.StandardInput.WriteLine(richTextBox2.Text);
            cmdProcess.StandardInput.WriteLine("exit");

            cmdProcess.WaitForExit();

            // And now that everything's done, just set the text
            // to whatever's in the stringbuilder
            richTextBox1.Text = m_output.ToString();

            // We're done with the stringbuilder, let the garbage
            // collector free it
            m_output = null;
        }
    }

    // Note: This is no longer a static method so it has
    // access to the member variables, including m_output
    void cmd_DataReceived(object sender, DataReceivedEventArgs e)
    {
        Debug.WriteLine("Output from other process");
        Debug.WriteLine(e.Data);

        // Add the data, one line at a time, to the string builder
        m_output.AppendLine(e.Data);
    }

输入cmd命令，显示结果到richtextbox c#

Type cmd command, display result to richtextbox c#

c#

cmd

richtextbox