Question

有没有办法可以在DataGridViewTextBox列中禁用非数字数据？

我的数据库中的字段是浮点数，我希望用户只能输入数值。

Answer 1

我个人没有遇到过，但我知道几种方法。您可以定义自己的列类型来限制它，或者您可以处理DataGridView事件。

看看这里：http://msdn.microsoft.com/en-us/library/wc5cbb9z.aspx

具体来说：CellValidating和CellValueChanged

Answer 2

您还可以尝试侦听DataFridViewTextBox列的编辑控件的TextChanged事件，并防止用户在文本框中输入无效值。 E.x：


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        string _prevValue;
        int _selLength;
        int _selStart;
        private bool _ignoreTxtChange;

        public Form1()
        {
            DataGridView dataGridView = new DataGridView();
            dataGridView.Dock = DockStyle.Fill;
            Controls.Add(dataGridView);
            DataTable ds = new DataTable();
            ds.Columns.Add("FloatValue", typeof(float));
            dataGridView.DataSource = ds;
            dataGridView.EditingControlShowing += dataGridView_EditingControlShowing;
        }

        private void dataGridView_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
        {
            DataGridView dataGridView = (DataGridView)sender;
            TextBox textBox = e.Control as TextBox;
            if (textBox == null)
            {
                return;
            }
            textBox.TextChanged -= textBox_TextChanged;
            DataGridViewColumn floatColumn = dataGridView.Columns["FloatValue"];
            if (dataGridView.CurrentCell.ColumnIndex != floatColumn.Index)
            {
                return;
            }
            textBox.TextChanged += textBox_TextChanged;
            _prevValue = textBox.Text;
        }

        void textBox_TextChanged(object sender, EventArgs e)
        {
            if (_ignoreTxtChange)
            {
                return;
            }
            _ignoreTxtChange = true;
            TextBox textBox = (TextBox)sender;
            float value;
            if ((_prevValue == textBox.Text) || float.TryParse(textBox.Text, out value))
            {
                _prevValue = textBox.Text;
                _selLength = textBox.SelectionLength;
                _selStart = textBox.SelectionStart;
            }
            else
            {
                textBox.Text = _prevValue;
                textBox.Select((_selStart == 0) ? 0 : _selStart - 1, _selLength);
            }
            _ignoreTxtChange = false;
        }
    }
}

禁用DataGridViewTextBoxColumn上的文本

2 个答案: