c# - 在 DataGridView 中将字符串转换为 DateTime

Question

我的数据在服务器上以 smalldatetime 的形式存在，但是当我将此数据返回到我的应用程序时，它会以 string 的形式返回给我。发生这种情况的原因多种多样，但不适用于此问题。

我想做的是，当这些数据填充到我的 DataGridView 中时，我需要将其格式化为 datetime，只有日期没有时间，格式为 'mm/dd/yyyy'。我已尝试以下操作，但数据仍采用 'mm/dd/yyyy hh:mm' 格式:

this.DataGridView.Columns[7].DefaultCellStyle.Format = "d";

如何格式化这列数据？

Answer 1

使用Column.DefaultCellStyle.Format属性或设置它 in designer

或

dataGridView1.Columns[0].DefaultCellStyle.Format = "MM'/'dd'/'yyyy";

或

你可以设置你想要的格式:

dataGridViewCellStyle.Format = "MM/dd/yyyy";
this.date.DefaultCellStyle = dataGridViewCellStyle;
// date being a System.Windows.Forms.DataGridViewTextBoxColumn

你可以这样做......

private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
    // If the column is the Artist column, check the
    // value.
    if (this.dataGridView1.Columns[e.ColumnIndex].Name == "Artist")
    {
        if (e.Value != null)
        {
            // Check for the string "pink" in the cell.
            string stringValue = (string)e.Value;
            stringValue = stringValue.ToLower();
            if ((stringValue.IndexOf("pink") > -1))
            {
                e.CellStyle.BackColor = Color.Pink;
            }

        }
    }
    else if (this.dataGridView1.Columns[e.ColumnIndex].Name == "Release Date")
    {
        ShortFormDateFormat(e);
    }
}

//Even though the date internaly stores the year as YYYY, using formatting, the
//UI can have the format in YY.  
private static void ShortFormDateFormat(DataGridViewCellFormattingEventArgs formatting)
{
    if (formatting.Value != null)
    {
        try
        {
            System.Text.StringBuilder dateString = new System.Text.StringBuilder();
            DateTime theDate = DateTime.Parse(formatting.Value.ToString());

            dateString.Append(theDate.Month);
            dateString.Append("/");
            dateString.Append(theDate.Day);
            dateString.Append("/");
            dateString.Append(theDate.Year.ToString().Substring(2));
            formatting.Value = dateString.ToString();
            formatting.FormattingApplied = true;
        }
        catch (FormatException)
        {
            // Set to false in case there are other handlers interested trying to
            // format this DataGridViewCellFormattingEventArgs instance.
            formatting.FormattingApplied = false;
        }
    }
}

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