C# inputBox文字输入对话框

private string InputBox(string Caption, string Hint, string Default)
        ...{
            //by 闫磊 Email:Landgis@126.com,yanleigis@21cn.com 2007.10.10
            Form InputForm = new Form();
            InputForm.MinimizeBox = false;
            InputForm.MaximizeBox = false;
            InputForm.StartPosition = FormStartPosition.CenterScreen;
            InputForm.Width = 220;
            InputForm.Height = 150;
            //InputForm.Font.Name = "宋体";
            //InputForm.Font.Size = 10;

            InputForm.Text = Caption;
            Label lbl = new Label();
            lbl.Text = Hint;
            lbl.Left = 10;
            lbl.Top = 20;
            lbl.Parent = InputForm;
            lbl.AutoSize = true;
            TextBox tb = new TextBox();
            tb.Left = 30;
            tb.Top = 45;
            tb.Width = 160;
            tb.Parent = InputForm;
            tb.Text = Default;
            tb.SelectAll();
            Button btnok = new Button();
            btnok.Left = 30;
            btnok.Top = 80;
            btnok.Parent = InputForm;
            btnok.Text = "确定";
            InputForm.AcceptButton = btnok;//回车响应

            btnok.DialogResult = DialogResult.OK;
            Button btncancal = new Button();
            btncancal.Left = 120;
            btncancal.Top = 80;
            btncancal.Parent = InputForm;
            btncancal.Text = "取消";
            btncancal.DialogResult = DialogResult.Cancel;
            try
            ...{
                if (InputForm.ShowDialog() == DialogResult.OK)
                ...{
                    return tb.Text;
                }
                else
                ...{
                    return null;
                }
            }
            finally
            ...{
                InputForm.Dispose();
            }

        }

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