silverlight 文本框只能输入汉字

 private void txtName_KeyDown(object sender, KeyEventArgs e)

        {

            Regex rg = new Regex("^[\u4e00-\u9fa5\b]$"); //\b是退格键     

            if (!rg.IsMatch(e.Key.ToString()))

            {

                e.Handled = true;



            }

            if (txtName.Text.Length >= 20)

            {

                txtName.Text = txtName.Text.Substring(0, 20);

                EasySL.Controls.Window.Alert("请输入20内的名称", this.floatePanel);

            }



        }

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