Devexpress Gridview 自定义汇总CustomSummaryCalculate(加权平均)
Devexpress Gridview 提供了简单的求和,平均等方法,复杂的汇总方法则需要自定义,使用gridview 的CustomSummaryCalculate 事件,根据官网的文档及各论坛案例实现加权平均的方法。
gridView1.CustomSummaryCalculate += new CustomSummaryEventHandler(view_CustomSummaryCalculate);
自定义汇总方法(加权平均)
计算公式:若n个数 的权分别是
,那么

叫做这n个数的加权平均值。
private void gridView1_CustomSummaryCalculate(object sender, DevExpress.Data.CustomSummaryEventArgs e)
{
if (e.Item != null)
{
//if (e.IsGroupSummary) {} 分组汇总
//if (e.IsTotalSummary) {} 全部汇总 var gridView = sender as DevExpress.XtraGrid.Views.Grid.GridView;
if (gridView.Columns.ColumnByFieldName(WeightColumn) != null)
{
GridSummaryItem gridSummaryItem = e.Item as DevExpress.XtraGrid.GridSummaryItem;
switch (e.SummaryProcess)
{
//calculation entry point
case DevExpress.Data.CustomSummaryProcess.Start:
customSummaryValue = ;
sumWt = ;
break;
//consequent calculations
case CustomSummaryProcess.Calculate:
if (e.FieldValue != null && e.FieldValue != DBNull.Value)
{
sumWt += Convert.ToDecimal(gridView.GetRowCellValue(e.RowHandle, WeightColumn));
customSummaryValue += Convert.ToDecimal(e.FieldValue) * Convert.ToDecimal(gridView.GetRowCellValue(e.RowHandle, WeightColumn));
}
break;
//final summary value
case CustomSummaryProcess.Finalize:
e.TotalValue = ((sumWt == ) ? : (customSummaryValue / sumWt));
break;
}
}
}
}
示例图片
示例功能代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms; using DevExpress.XtraGrid.Views.Grid.ViewInfo;
using DevExpress.XtraGrid.Views.Grid;
using DevExpress.XtraEditors;
using DevExpress.XtraGrid;
using DevExpress.Data; namespace TEST
{
public partial class FormAverage : Form
{
public FormAverage()
{
InitializeComponent();
} private void FormAverage_Load(object sender, EventArgs e)
{
// 显示记录数量
GridColumnSummaryItem idTotal = new GridColumnSummaryItem();
idTotal.SummaryType = SummaryItemType.Count;
idTotal.DisplayFormat = "{0} records"; // 对 Length 字段列 汇总平均
GridColumnSummaryItem lengthAverage = new GridColumnSummaryItem();
lengthAverage.SummaryType = SummaryItemType.Average;
lengthAverage.FieldName = "Length";
lengthAverage.DisplayFormat = "Average: {0:#.#}"; // 汇总项目绑定到相应列,显示在view footer
gridView1.Columns["ID"].SummaryItem.Collection.Add(idTotal);
gridView1.Columns["Length"].SummaryItem.Collection.Add(lengthAverage);
gridView1.OptionsView.ShowFooter = true; DataTable dt = new DataTable();
dt.Columns.Add("ID", typeof(int));
dt.Columns.Add("Length", typeof(int));
dt.Columns.Add("Price", typeof(decimal));
dt.Columns.Add("Num", typeof(int));
dt.Rows.Add(, , , );
dt.Rows.Add(, , , );
dt.Rows.Add(, , , );
dt.Rows.Add(, , , );
this.gridControl1.DataSource = dt;
this.gridColumn1.Summary.AddRange(new DevExpress.XtraGrid.GridSummaryItem[] {
new DevExpress.XtraGrid.GridColumnSummaryItem(DevExpress.Data.SummaryItemType.Min, "Price", "MIN={0}", "Min"),
new DevExpress.XtraGrid.GridColumnSummaryItem(DevExpress.Data.SummaryItemType.Count, "Price", "Count = {0}", "Count"),
new DevExpress.XtraGrid.GridColumnSummaryItem(DevExpress.Data.SummaryItemType.Custom, "Price", "Custom Summary = {0}")});
CalacWeightAverage(gridView1, "Price", "Length","Num");
} Decimal sumWt = ; //权重和
Decimal customSummaryValue;
string WeightColumn; //权重列 //计算加权平均
void CalacWeightAverage(DevExpress.XtraGrid.Views.Grid.GridView view, string weightColumn, params string[] weightAverageColumns)
{
WeightColumn = weightColumn;
if (view.Columns.ColumnByFieldName(weightColumn) != null)
{
if ((view.Columns[weightColumn].ColumnType == typeof(decimal))
|| (view.Columns[weightColumn].ColumnType == typeof(int)))
{
for (int i = ; i < weightAverageColumns.Length; i++)
{
string fieldName = weightAverageColumns[i];
if (view.Columns.ColumnByFieldName(fieldName) != null
&& (!(view.Columns[fieldName].ColumnType != typeof(decimal))
|| !(view.Columns[fieldName].ColumnType != typeof(int))))
{
view.Columns[fieldName].SummaryItem.SummaryType = SummaryItemType.Custom;
GridSummaryItem gridSummaryItem = view.GroupSummary.Add(SummaryItemType.Custom, fieldName, view.Columns[fieldName]);
gridSummaryItem.DisplayFormat = view.Columns[fieldName].SummaryItem.DisplayFormat;
}
}
//gridView1.CustomSummaryCalculate += new CustomSummaryEventHandler(gridView1_CustomSummaryCalculate);
}
}
} // 自定义汇总算法
private void gridView1_CustomSummaryCalculate(object sender, DevExpress.Data.CustomSummaryEventArgs e)
{
if (e.Item != null)
{
//if (e.IsGroupSummary) {} 分组汇总
//if (e.IsTotalSummary) {} 全部汇总 var gridView = sender as DevExpress.XtraGrid.Views.Grid.GridView;
if (gridView.Columns.ColumnByFieldName(WeightColumn) != null)
{
GridSummaryItem gridSummaryItem = e.Item as DevExpress.XtraGrid.GridSummaryItem;
switch (e.SummaryProcess)
{
//calculation entry point
case DevExpress.Data.CustomSummaryProcess.Start:
customSummaryValue = ;
sumWt = ;
break;
//consequent calculations
case CustomSummaryProcess.Calculate:
if (e.FieldValue != null && e.FieldValue != DBNull.Value)
{
sumWt += Convert.ToDecimal(gridView.GetRowCellValue(e.RowHandle, WeightColumn));
customSummaryValue += Convert.ToDecimal(e.FieldValue) * Convert.ToDecimal(gridView.GetRowCellValue(e.RowHandle, WeightColumn));
}
break;
//final summary value
case CustomSummaryProcess.Finalize:
e.TotalValue = ((sumWt == ) ? : (customSummaryValue / sumWt));
break;
}
}
}
}
}
}
参考资料:
https://documentation.devexpress.com/CoreLibraries/DevExpress.Data.CustomSummaryEventArgs.class
https://www.cnblogs.com/EasyInvoice/p/3892136.html
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