鎖定從非UI線程調用的RichTextBox

Question

給定以下代碼，我如何能夠鎖定richtextbox，以便每個日志調用在另一個可以開始鍵入之前完成工作？

private delegate void ReportLogDelegate(RichTextBox box, Color color, string message);

public void FileLog(string file, string project, string type, string fileNr, string note)
{
    if (type == "incoming")
    {
        this.Invoke(new ReportLogDelegate(this.AppendText), new object[] { logTextBox, Color.Orange, String.Format("{0} - {1}", DateTime.Now.ToShortDateString(), DateTime.Now.ToShortTimeString()) });
        string message = string.Format("\n\tFile Incoming\n\tFile: {0}\n\tProject: {1}\n\tFileNumber: {2}\n\n", file, project, fileNr);
        this.Invoke(new ReportLogDelegate(this.AppendText), new object[] { logTextBox, Color.White, message });
    }
    else if (type == "done")
    {
        this.Invoke(new ReportLogDelegate(this.AppendText), new object[] { logTextBox, Color.GreenYellow, String.Format("{0} - {1}", DateTime.Now.ToShortDateString(), DateTime.Now.ToShortTimeString()) });
        string message = string.Format("\n\tFile Received\n\tFile: {0}\n\tProject: {1}\n\tFileNumber: {2}\n\n", file, project, fileNr);
        this.Invoke(new ReportLogDelegate(this.AppendText), new object[] { logTextBox, Color.White, message });
    }
    else if (type == "error")
    {
        this.Invoke(new ReportLogDelegate(this.AppendText), new object[] { logTextBox, Color.Red, String.Format("{0} - {1}", DateTime.Now.ToShortDateString(), DateTime.Now.ToShortTimeString()) });
        string message = string.Format("\n\tError Receiving File\n\tFile: {0}\n\tProject: {1}\n\tFileNumber: {2}\n\tError: {3}\n\n", file, project, fileNr, note);
        this.Invoke(new ReportLogDelegate(this.AppendText), new object[] { logTextBox, Color.Red, message });
    }
}


// Append text of the given color.
void AppendText(RichTextBox box, Color color, string text)
{
    int start = box.TextLength;
    box.AppendText(text);
    int end = box.TextLength;

    // Textbox may transform chars, so (end-start) != text.Length
    box.Select(start, end - start);
    {
        box.SelectionColor = color;
        // could set box.SelectionBackColor, box.SelectionFont too.
    }
    box.SelectionLength = 0; // clear
}

應該允許對FileLog的每次調用運行到最后，直到另一個可以訪問RTB。

Answer 1

只需將整個方法放入一個lock塊中即可。 創建一個新的私有對象進行鎖定，以確保沒有其他方法可以使用相同的同步鎖定：

private object key = new object();
public void FileLog(string file, string project, string type, string fileNr, string note)
{
    lock(key)
    {
        //your existing implementation goes here
    }
}

這是假設您沒有其他方法也可以訪問該富文本框。 如果確實有其他對象，則需要確保所有對象都可以訪問您鎖定的對象。