C# datagridview 输入时间格式

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//自己学习，参考多篇文章，未能写入文章来源敬请原谅！

// 采用单元格事件响应，datagridview 中没有textchange响应事件

/*

有几点要说明的

1. EditingControlShowing 是DataGridView自带的事件，当某个cell被编辑时就会激发该事件。接着就到了dataGridView1_EditingControlShowing 函数，然后（if…else if…）判断那个cell是DataGridViewComboBoxEditingControl还是DataGridViewTextBoxEditingControl 控件类型。判断好控件类型之后就可以用该类型自带的事件，例如DataGridViewComboBoxEditingControl 自带的SelectedIndexChanged 事件。

2. 为什么用dataGridView1.CurrentCell.EditedFormattedValue而不是dataGridView1.CurrentCell.Value，因为处于编辑状态的cell的Value是没有同时更新的，我们更改的是它的EditedFormattedValue。这个区别当然有好处，这里不谈。

3. 为什么要加一句e.CellStyle.BackColor = Color.FromName("window") ？实践是检验真理的标准，不妨去掉这句运行一下就清楚了。

public partial class Arrange : Form    { public Arrange()        {            InitializeComponent();            this.dataGridView1.EditingControlShowing +=                new DataGridViewEditingControlShowingEventHandler(dataGridView1_EditingControlShowing);        }//编辑cell时激发的事件        void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)        {            if (e.Control.GetType().Equals(typeof(DataGridViewTextBoxEditingControl)))//cell为类TextBox时            {                e.CellStyle.BackColor = Color.FromName("window");                DataGridViewTextBoxEditingControl editingControl = e.Control as DataGridViewTextBoxEditingControl;                editingControl.TextChanged += new EventHandler(editingControl_TextChanged);            }        }        //TextBox的TextChanged事件        void editingControl_TextChanged(object sender, EventArgs e)        {                       if (sender is DataGridViewTextBoxEditingControl                && dataGridView1.CurrentCell != null                && dataGridView1.Columns[dataGridView1.CurrentCell.ColumnIndex].Name == "Column2")            {                int cursorPos = ((DataGridViewTextBoxEditingControl)sender).SelectionStart;                string oldText = ((DataGridViewTextBoxEditingControl)sender).Text;                StringBuilder newText = new StringBuilder();                int numCount = 0;                bool isColon = false;                for (int i = 0; i < oldText.Length; i++)                {                                       System.Text.RegularExpressions.Match match = System.Text.RegularExpressions.Regex.Match(oldText[i].ToString(), "[0-9]");                    if (match.Success)                    {                        numCount++;                                              if (numCount == 3 && isColon == false)                        {                            newText.Append(":");                            isColon = true;                            cursorPos++;    // 位置調整                        }                        newText.Append(oldText[i]);                    }                    else                    {                                               if (":".Equals(oldText[i].ToString()) && isColon == false                            && (numCount == 1 || numCount == 2))                        {                            newText.Append(":");                            isColon = true;                        }                    }                }                if (!(oldText.Equals(newText.ToString())))                {                    ((DataGridViewTextBoxEditingControl)sender).Text = newText.ToString();                                       ((DataGridViewTextBoxEditingControl)sender).SelectionLength = 0;                    if (cursorPos > newText.ToString().Length)                    {                        ((DataGridViewTextBoxEditingControl)sender).SelectionStart = newText.ToString().Length;                    }                    else                    {                        ((DataGridViewTextBoxEditingControl)sender).SelectionStart = cursorPos;                    }                }            }        }}