Question

我有一个DevExpress gridview，其中包含一个已启用列标题过滤器的描述列。问题是启用这些过滤器会使得在列表中的每个数据项的下拉列表中添加一个条目，这是不太理想的，因为条目通常是文本段落。相反，我想将选项限制为All，Blanks和Non blanks，但我无法找到一个如何实现这一目标的明确例子。谢谢你的帮助！

答案：

settings.HeaderFilterFillItems = (sender, e) =>
{
    if (e.Column.FieldName == "Description")
    {
       e.Values.Clear();
       e.AddShowAll();
       e.Values.Insert(1, FilterValue.CreateShowBlanksValue(e.Column, "(Blanks)"));
       e.Values.Insert(2, FilterValue.CreateShowNonBlanksValue(e.Column, "(Non Blanks)"));
    }
};

Answer 1

此问题与您的https://www.devexpress.com/Support/Center/Question/Details/Q477323/gridview-how-to-customize-header-filter-items

相似

在视图中，您可以使用 settings.HeaderFilterFillItems https://demos.devexpress.com/MVCxGridViewDemos/Filtering/Filtering

自定义过滤条目

@Html.DevExpress().GridView(
    settings => {
        settings.Name = "gvFiltering";
        settings.CallbackRouteValues = new { Controller = "Filtering", Action = "FilteringPartial", EnableCheckedListMode = ViewBag.EnableCheckedListMode };
        settings.Width = Unit.Percentage(100);

        settings.Columns.Add("CompanyName");
        settings.Columns.Add("Country");
        settings.Columns.Add("City");
        settings.Columns.Add("UnitPrice").PropertiesEdit.DisplayFormatString = "c";
        settings.Columns.Add("Quantity");
        settings.Columns.Add("Discount").PropertiesEdit.DisplayFormatString = "p0";
        settings.Columns.Add(column => {
            column.FieldName = "Total";
            column.PropertiesEdit.DisplayFormatString = "c";
            column.UnboundType = DevExpress.Data.UnboundColumnType.Decimal;
            column.UnboundExpression = "UnitPrice * Quantity * (1 - Discount)";
        });

        settings.Settings.ShowHeaderFilterButton = true;
        settings.SettingsPopup.HeaderFilter.Height = 200;

        var headerFilterMode = ViewBag.EnableCheckedListMode ? GridHeaderFilterMode.CheckedList : GridHeaderFilterMode.List;
        foreach(GridViewDataColumn column in settings.Columns)
            column.SettingsHeaderFilter.Mode = headerFilterMode;

        settings.HeaderFilterFillItems = (sender, e) => {
            ASPxGridView grid = (ASPxGridView)sender;
            if(e.Column.FieldName == "Total") {
                e.Values.Clear();
                if(e.Column.SettingsHeaderFilter.Mode == GridHeaderFilterMode.List)
                e.AddShowAll();
                int step = 100;
                for(int i = 0; i < 10; i++) {
                    double start = step * i;
                    double end = start + step - 0.01;
                    e.AddValue(string.Format("from {0:c} to {1:c}", start, end), string.Empty, string.Format("[Total] >= {0} and [Total] <= {1}", start, end));
                }
                e.AddValue(string.Format("> {0:c}", 1000), string.Empty, "[Total] > 1000");
            } else if(e.Column.FieldName == "Quantity") {
                int max = 0;
                for(int i = 0; i < e.Values.Count; i++) {
                    int value;
                    if(!int.TryParse(e.Values[i].Value, out value))
                        continue;
                    if(value > max)
                        max = value;
                }
                e.Values.Clear();
                if(e.Column.SettingsHeaderFilter.Mode == GridHeaderFilterMode.List)
                e.AddShowAll();
                int step = 10;
                for(int i = 0; i < max / step + 1; i++) {
                    int start = step * i;
                    int end = start + step - 1;
                    e.AddValue(string.Format("from {0} to {1}", start, end), string.Empty, string.Format("[Quantity] >= {0} and [Quantity] <= {1}", start, end));
                }
            }
        };
    }).Bind(Model).GetHtml()

设置GridView标头过滤器

1 个答案: