Question

需要帮助。我是Visual Studio C＃的新手。我只用一个按钮和文本框创建一个WINDOWS FORM APPLICATION。基本上我想要做的是运行一个包含oracle块的sql文件，并希望从块生成的输出（dbms_output）显示在文本框中。

直到现在我完成了调用sqlplus并执行该文件并通过消息框检索输出。但是当我尝试使用文本框执行相同操作时，我会遇到运行时错误。

System.InvalidOperationException未处理 Message =跨线程操作无效：控制'textBox1'从其创建的线程以外的线程访问。来源= System.Windows.Forms的堆栈跟踪：在System.Windows.Forms.Control.get_Handle（）在System.Windows.Forms.Control.set_WindowText（String value） at System.Windows.Forms.TextBoxBase.set_WindowText（String value）在System.Windows.Forms.Control.set_Text（String value） at System.Windows.Forms.TextBoxBase.set_Text（String value） at System.Windows.Forms.TextBox.set_Text（String value）在WindowsFormsApplication1.Form1.myProcess_OutputDataReceived（对象 sender，DataReceivedEventArgs e）in C：\ Users \用户sj0087652.TECHMAHINDRA \应用程序数据\本地\临时 Projects \ WindowsFormsApplication1 \ Form1.cs：第22行 at System.Diagnostics.Process.OutputReadNotifyUser（String data）在System.Diagnostics.AsyncStreamReader.FlushMessageQueue（）在System.Diagnostics.AsyncStreamReader.GetLinesFromStringBuilder（）在System.Diagnostics.AsyncStreamReader.ReadBuffer（IAsyncResult ar）在System.Runtime.Remoting.Messaging.AsyncResult.SyncProcessMessage（IMessage） MSG）在System.Runtime.Remoting.Messaging.StackBuilderSink.AsyncProcessMessage（IMessage） msg，IMessageSink replySink）在System.Runtime.Remoting.Proxies.AgileAsyncWorkerItem.DoAsyncCall（）在System.Runtime.Remoting.Proxies.AgileAsyncWorkerItem.ThreadPoolCallBack（Object O）在System.Threading.QueueUserWorkItemCallback.WaitCallback_Context（Object 州） at System.Threading.ExecutionContext.Run（ExecutionContext executionContext，ContextCallback callback，Object state，Boolean ignoreSyncCtx）在System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem（）在System.Threading.ThreadPoolWorkQueue.Dispatch（）在System.Threading._ThreadPoolWaitCallback.PerformWaitCallback（）的InnerException：

现在我的问题如下：

如何在文本框中输出输出。
有没有更好的处理例外的方法。
有没有更好的方法通过C＃执行包含oracle块的sql文件。

以下是我的代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    void myProcess_OutputDataReceived(object sender, System.Diagnostics.DataReceivedEventArgs e)
    {
        MessageBox.Show(e.Data);
        textBox1.Text += e.Data;
    }

    void myProcess_Exited(object sender, EventArgs e)
    {
        MessageBox.Show("Exit");

    }

    void myProcess_ErrorDataReceived(object sender, System.Diagnostics.DataReceivedEventArgs e)
    {
        MessageBox.Show("error", e.Data);
    } 
    private void button1_Click(object sender, EventArgs e)
    {
        myProcess = new System.Diagnostics.Process();
        myProcess.StartInfo.FileName = "sqlplus.exe";
        myProcess.StartInfo.WorkingDirectory = "";
        myProcess.StartInfo.Arguments = "-s hr/hr@XE";
        myProcess.StartInfo.RedirectStandardInput = true;
        myProcess.StartInfo.RedirectStandardOutput = true;
        myProcess.StartInfo.RedirectStandardError = true;
        myProcess.StartInfo.UseShellExecute = false;
        myProcess.StartInfo.CreateNoWindow = true;
        myProcess.OutputDataReceived += new System.Diagnostics.DataReceivedEventHandler(myProcess_OutputDataReceived);
        myProcess.ErrorDataReceived += new System.Diagnostics.DataReceivedEventHandler(myProcess_ErrorDataReceived);
        myProcess.Exited += new EventHandler(myProcess_Exited);
        myProcess.Start();
        myProcess.BeginErrorReadLine();
        myProcess.BeginOutputReadLine();
        myProcess.StandardInput.WriteLine("@C:\\Users\\sj0087652\\Documents\\trial_script.sql");

        myProcess.Close(); 
    }
           public System.Diagnostics.Process myProcess { get; set; }
}

}
)

Answer 1

这可能是您最好的选择：

delegate void AddContentDelegate(string Text);
public partial class Form1 : Form
{
    AddContentDelegate AddContent;
    public Form1()
    {
        InitializeComponent();

        AddContent = new AddContentDelegate(AddContentFunction);
    }

    void AddContentFunction(string Text)
    {
        MessageBox.Show(Text);
        textBox1.Text += Text + "\r\n";
    }


    void myProcess_OutputDataReceived(object sender, DataReceivedEventArgs e)
    {
        BeginInvoke(AddContent, e.Data);
    }

    void myProcess_Exited(object sender, EventArgs e)
    {
        MessageBox.Show("Exit");

    }

    void myProcess_ErrorDataReceived(object sender, DataReceivedEventArgs e)
    {
        MessageBox.Show("error", e.Data);
    } 
    private void button1_Click(object sender, EventArgs e)
    {
        myProcess = new System.Diagnostics.Process();
        myProcess.StartInfo.FileName = "sqlplus.exe";
        myProcess.StartInfo.WorkingDirectory = "";
        myProcess.StartInfo.Arguments = "-s hr/hr@XE";
        myProcess.StartInfo.RedirectStandardInput = true;
        myProcess.StartInfo.RedirectStandardOutput = true;
        myProcess.StartInfo.RedirectStandardError = true;
        myProcess.StartInfo.UseShellExecute = false;
        myProcess.StartInfo.CreateNoWindow = true;
        myProcess.OutputDataReceived += new DataReceivedEventHandler(myProcess_OutputDataReceived);
        myProcess.ErrorDataReceived += new DataReceivedEventHandler(myProcess_ErrorDataReceived);
        myProcess.Exited += new EventHandler(myProcess_Exited);
        myProcess.Start();
        myProcess.BeginErrorReadLine();
        myProcess.BeginOutputReadLine();
        myProcess.StandardInput.WriteLine("@C:\\Users\\sj0087652\\Documents\\trial_script.sql");

        myProcess.Close(); 
    }
    public System.Diagnostics.Process myProcess;
}

BeginInvoke将在GUI线程上调用该函数（或本例中的Delegate）。您得到的错误是因为它试图跨线程编辑文本框。

您可能希望将其更改为Invoke，以防止使用弹出框发送垃圾邮件。唯一的区别是Invoke将等到函数完成后再继续。

执行包含oracle块的sql文件

1 个答案: