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DevExpress中针对指定列进行百分比转换
2022-08-05 05:40:00 【牛奶咖啡13】
一、业务需求
目前使用DevExpress控件开发的项目中,需要对表格(GirdView)的指定列或多列内容进行转为百分比显示(比如:将0.39转为39%以此类推)。
二、需求分析
实现对表格列的内容转为百分比有3种思路:
①直接对指定列的数据进行百分比处理,即(获取到指定列的数据,然后乘以100在添加百分比(%)符号);
②直接使用GridView自带的【DisplayFormat.FormatString】内容进行设置进行百分比显示(P2表示保留小数点后2位的百分比【比如:0.3956转为39.56%】);
③直接给数字后面添加百分比符号(比如:39转为39%)
三、实现方法
这里以使用GridView自带的【DisplayFormat.FormatString】内容进行设置进行百分比显示和直接给数字后面添加百分比符号(比如:39转为39%)进行实现说明:
3.1、必须先将需要转为百分比的列值转为数字格式
注意:转换格式方法必须在dataTable数据附值前
//设置列数据类型为double
dt.Columns[列名称].DataType = typeof(数据类型);
//比如:设置线宽数据类型为double
dt.Columns["TRIAL_LINEWIDTH"].DataType = typeof(double);
3.2、转换指定列或多列为百分比的代码
/// <summary>
/// 设置表格所有单元格都保留2位小数
/// </summary>
/// <param name="gridView">gridView组件</param>
public static void ResreserveTwoBit(GridView gridView)
{
if (gridView != null && gridView.Columns.Count > 0)
{
int count = gridView.Columns.Count;
for (int i = 0; i < count; i++)
{
gridView.Columns[i].DisplayFormat.FormatType = FormatType.Numeric;
gridView.Columns[i].DisplayFormat.FormatString = "F2";
}
}
}
/// <summary>
/// 设置表格指定单元格都保留2位小数
/// </summary>
/// <param name="gridView">gridView组件</param>
/// <param name="startColumnIndex">开始列索引</param>
/// <param name="endColumnIndex">结束列索引</param>
public static void ResreserveTwoBit(GridView gridView, int startColumnIndex, int endColumnIndex)
{
if (gridView != null && gridView.Columns.Count > 0 &&
startColumnIndex > 0 && endColumnIndex > 0 &&
endColumnIndex <= gridView.Columns.Count)
{
//int count = gridView.Columns.Count;
for (int i = startColumnIndex; i <= endColumnIndex; i++)
{
gridView.Columns[i].DisplayFormat.FormatType = FormatType.Numeric;
gridView.Columns[i].DisplayFormat.FormatString = "F2";
}
}
}
/// <summary>
/// 设置表格指定单元格都保留2位小数
/// </summary>
/// <param name="gridView">gridView组件</param>
/// <param name="startColumnIndex">开始列索引</param>
/// <param name="endColumnIndex">结束列索引</param>
public static void ResreserveTwoBit(GridView gridView, string columnName)
{
if (gridView != null && gridView.Columns.Count > 0 && !string.IsNullOrEmpty(columnName))
{
gridView.Columns[columnName].DisplayFormat.FormatType = FormatType.Numeric;
gridView.Columns[columnName].DisplayFormat.FormatString = "F2";
}
}
/// <summary>
/// 设置表格指定单元格都使用百分比
/// </summary>
/// <param name="gridView">gridView组件</param>
/// <param name="startColumnIndex">开始列索引</param>
/// <param name="endColumnIndex">结束列索引</param>
public static void SetPercentage(GridView gridView, int startColumnIndex, int endColumnIndex)
{
if (gridView != null && gridView.Columns.Count > 0 &&
startColumnIndex > 0 && endColumnIndex > 0 &&
endColumnIndex <= gridView.Columns.Count)
{
//int count = gridView.Columns.Count;
for (int i = startColumnIndex; i <= endColumnIndex; i++)
{
gridView.Columns[i].DisplayFormat.FormatType = FormatType.Numeric;
gridView.Columns[i].DisplayFormat.FormatString = "P2";
}
}
}
/// <summary>
/// 设置表格指定单元格都使用百分比
/// </summary>
/// <param name="gridView">gridView组件</param>
/// <param name="columnName">列名称</param>
public static void SetPercentage(GridView gridView, string columnName)
{
if (gridView != null && gridView.Columns.Count > 0 && !string.IsNullOrEmpty(columnName))
{
gridView.Columns[columnName].DisplayFormat.FormatType= FormatType.Numeric;
gridView.Columns[columnName].DisplayFormat.FormatString = "P2";
}
}
/// <summary>
/// 设置表格指定单元格都使用百分比
/// </summary>
/// <param name="gridView">gridView组件</param>
/// <param name="columnName">列名称</param>
/// <param name="keepDecimalPlaces">保留的小数位数(默认保留2位)</param>
public static void SetPercentage(GridView gridView, string columnName,string keepDecimalPlaces="P2")
{
if (gridView != null && gridView.Columns.Count > 0 && !string.IsNullOrEmpty(columnName) && !string.IsNullOrEmpty(keepDecimalPlaces))
{
gridView.Columns[columnName].DisplayFormat.FormatType = FormatType.Numeric;
gridView.Columns[columnName].DisplayFormat.FormatString = keepDecimalPlaces;
}
}
/// <summary>
/// 给表格指定单元格都保留2位小数后添加%号
/// </summary>
/// <param name="gridView"></param>
/// <param name="startColumnIndex"></param>
/// <param name="endColumnIndex"></param>
public static void SetResreserveTwoBitAndPercentageChar(GridView gridView, int startColumnIndex, int endColumnIndex)
{
if (gridView != null && gridView.Columns.Count > 0 &&
startColumnIndex > 0 && endColumnIndex > 0 &&
endColumnIndex <= gridView.Columns.Count)
{
for (int i = startColumnIndex; i <= endColumnIndex; i++)
{
gridView.Columns[i].DisplayFormat.FormatType = FormatType.Numeric;
gridView.Columns[i].DisplayFormat.FormatString = $"{0:N2}'%'";
}
}
}
/// <summary>
/// 给表格指定单元格都保留2位小数后添加%号
/// </summary>
/// <param name="gridView"></param>
/// <param name="columnName">列名称</param>
public static void SetResreserveTwoBitAndPercentageChar(GridView gridView, string columnName)
{
if (gridView != null && gridView.Columns.Count > 0 && !string.IsNullOrEmpty(columnName))
{
gridView.Columns[columnName].DisplayFormat.FormatType = FormatType.Numeric;
gridView.Columns[columnName].DisplayFormat.FormatString = $"{0:N2}'%'";
}
}
/// <summary>
/// 给表格指定单元格都添加%符号,不做运算
/// </summary>
/// <param name="gridView"></param>
/// <param name="columnName"></param>
public static void SetPercentageChar(GridView gridView, string columnName)
{
if (gridView != null && gridView.Columns.Count > 0 && !string.IsNullOrEmpty(columnName))
{
gridView.Columns[columnName].DisplayFormat.FormatType = FormatType.Numeric;
gridView.Columns[columnName].DisplayFormat.FormatString = $"{0}'%'";
}
}
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