Question

数据库我正在为我的应用程序连接＆＃34;％＆＃34;列使用小于1的值（即15％在数据库中存储为0,15），所以我使用格式=＆＃34; .00％＆＃34;在DataGrid列中显示值。

问题是如何正确地让用户插入大于1的值 - 在单元格中写入50或50％ - 并在数据库中将其转换为0.5。

我正在寻找DataGridViewCellValidatingEventHandler并添加了事件levDGV_PercentCellValidating，但我不知道如何更改值......

private void levDGV_PercentCellValidating(object sender, DataGridViewCellValidatingEventArgs e)
{

    string dataPropertyName = levDGV.Columns[e.ColumnIndex].DataPropertyName; // deliveryProcent
    // Abort validation if cell is not in the "deliveryProcent" column.
    if (!dataPropertyName.Equals("deliveryProcent")) return;
    levDGV.Rows[e.RowIndex].ErrorText = "";

    string testValue = e.FormattedValue.ToString();
    char lastChar = testValue[testValue.Length - 1];
    if (lastChar == (char)37)
    {
        //TODO: Remove % character from entered string
    }
    //TODO: divide the value by 100 and set as currentCell value
}

如何将输入的值转换为经过适当验证的值（除以100）？

Answer 1

为其他人留下解决方案，解析似乎对我有用：

private void levDGV_CellParsing(object sender, DataGridViewCellParsingEventArgs e)
        {
            string dataPropertyName = levDGV.Columns[e.ColumnIndex].DataPropertyName;
            if (dataPropertyName.Equals("deliveryProcent"))
            {
                if (e.Value != null)
                {
                    try
                    {
                        string testValueStr = e.Value.ToString();
                        char lastChar = testValueStr[testValueStr.Length - 1];
                        if (lastChar == (char)37)
                        {
                            //Remove % character from entered string
                            testValueStr = testValueStr.Substring(0, testValueStr.Length - 1);
                        }
                        //divide the value by 100 and set as currentCell value
                        double testValue = (Convert.ToDouble(testValueStr)) / 100;
                        e.Value = testValue;
                        e.ParsingApplied = true;
                    }
                    catch (FormatException)
                    {
                        // Set to false in case another CellParsing handler
                        // wants to try to parse this DataGridViewCellParsingEventArgs instance.
                        e.ParsingApplied = false;
                    }
                }

            }
        }

在验证期间更改DataGrid单元格值

1 个答案: