如何在文本框中灰显默认文本？

Question

当我点击文本框时，我希望默认文本消失。是否还有其他财产可以用于此目的？

Answer 1

将一个方法添加到TextBox的GotFocus事件中，该事件将Text属性更改为“”

private void Form1_Load(object sender, EventArgs e) {
    this.textBox1.GotFocus += new EventHandler(textBox1_Focus); 
    this.textBox1.Text = "some default text...";
}

protected void textBox1_Focus(Object sender, EventArgs e) {
    textBox1.Text = "";
}

Answer 2

听起来你想要在文本框中添加水印。

请参阅这些文章。

• http://www.codeproject.com/Articles/319910/Custom-TextBox-with-watermark
• Watermark in System.Windows.Forms.TextBox
• 如果您使用的是类似http://msdn.microsoft.com/en-us/library/bb613590.aspx
的wpf

Answer 3

以下将以灰色设置默认文本。此外，当您将文本框保留为空白时，再次将默认文本设置为文本框。

private void Form1_Load(object sender, EventArgs e)
    {
        this.textBox2.Enter += new EventHandler(textBox2_Enter); 
        this.textBox2.Leave += new EventHandler(textBox2_Leave);
        textBox2_SetText();
    }

    protected void textBox2_SetText()
    {
        this.textBox2.Text = "Default Text...";
        textBox2.ForeColor = Color.Gray;
    }

    private void textBox2_Enter(object sender, EventArgs e)
    {
        if (textBox2.ForeColor == Color.Black)
            return;
        textBox2.Text = "";
        textBox2.ForeColor = Color.Black;
    }
    private void textBox2_Leave(object sender, EventArgs e)
    {
        if (textBox2.Text.Trim() == "")
            textBox2_SetText();
    }