Question

我已经将RichTextBox子类化以添加语法突出显示，并且在手动更改文本时它可以正常工作。但是，在代码中首次设置OnTextChanged时，Text事件不会触发。

我的事件代码是

/// <summary>
/// When text changes keywords are searched for and highlighted
/// </summary>
/// <param name="e"></param>
protected override void OnTextChanged(EventArgs e)
{
    if (highlighting)
        return;

    int currentSelectionStart = this.SelectionStart;
    int currentSelectionLength = this.SelectionLength;

    base.OnTextChanged(e);

    String text = this.Text;
    this.Text = "";

    this.HighlightSyntax(text);

    this.SelectionStart = currentSelectionStart;
    this.SelectionLength = currentSelectionLength;
}

如何从代码设置文本时触发此事件，例如this.structureInFileTextBox.Text = obj.FileStructure;？我试过覆盖Text属性，但这会导致Visual Studio崩溃，我必须先从.cs文件中编辑它才能再次打开项目！

Answer 1

我会尝试这一点（我只更改了this.Text = "";中的base.Text = "";）：

/// <summary>
/// When text changes keywords are searched for and highlighted
/// </summary>
/// <param name="e"></param>
protected override void OnTextChanged(EventArgs e)
{
    if (highlighting)
        return;

    int currentSelectionStart = this.SelectionStart;
    int currentSelectionLength = this.SelectionLength;

    base.OnTextChanged(e);

    String text = this.Text;
    base.Text = "";

    this.HighlightSyntax(text);

    this.SelectionStart = currentSelectionStart;
    this.SelectionLength = currentSelectionLength;
}

并以这种方式覆盖Text属性：

public new string Text
{
    get { return base.Text; }
    set
    {
        if (base.Text != value)
        {
             base.Text = value;
             OnTextChanged(EventArgs.Empty);
        }
    }
}

在文本首次设置时，子类化的RichTextBox OnTextChange事件不会触发

1 个答案: