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我有一个包含一些数据的网格。它看起来像这张照片。

在此处输入图像描述

当我选择要删除的几行并单击删除按钮时，在删除按钮中我对服务器端操作进行了 ajax 调用。服务器端操作从数据库中删除选定的类别，并将它们从它维护的内存缓存中删除。

然后，它重定向到一个动作，该动作返回具有类别网格的局部视图，并为其提供更新的模型。

但是，当我们在服务器端操作成功完成后看到网格时，它仍然保持旧的显示，即我们刚刚删除的行仍然作为选定行出现在网格中。

以下是相关的代码片段。

服务器端：

[HttpPost]
        public ActionResult Delete(long[] categoryIds)
        {
            if (categoryIds != null && categoryIds.Length > 0)
            {
                foreach (var categoryId in categoryIds)
                {
                    Category.Delete(categoryId);

                    DeleteFromCachedCategories(categoryId);
                }
            }

            return PartialView("_CategoriesPartial", GetCategoryList());
        }


private IEnumerable<Category> GetCategoryList()
        {
            lock (padLock)
            {
                if (CacheManager.Contains(CacheKeys.AllCategories))
                {
                    return CacheManager.Get<IEnumerable<Category>>(CacheKeys.AllCategories);
                }
            }

            var list = Category.All as List<Category>;
            if (!list.Contains(Category.Empty)) list.Insert(0, Category.Empty);

            lock (padLock)
            {
                CacheManager.Add(CacheKeys.AllCategories, list);
            }

            return list;
        }

        private void UpdateCachedCategories(Category category)
        {
            var categories = CacheManager.Get<List<Category>>(CacheKeys.AllCategories);

            if (categories != null)
            {
                if (categories.AsEnumerable().Contains(category, Category.CategoryIdComparer))
                {
                    var cachedCategory = categories.SingleOrDefault(c => c.Id == category.Id);

                    cachedCategory.Name = category.Name ?? string.Empty;
                }
                else
                {
                    categories.Add(category);
                }
            }
        }

        private void DeleteFromCachedCategories(long categoryId)
        {
            var categories = CacheManager.Get<List<Category>>(CacheKeys.AllCategories);

            if (categories != null)
            {
                var index = categories.FindIndex(c => c.Id == categoryId);

                if (index >= 0)
                    categories.RemoveAt(index);
            }
        }

查看（剃刀）：[_CategoriesPartial.cshtml]

@using System.Web.UI.WebControls;
@using System.Data;
@model IEnumerable<GlobalizationUI.BusinessObjects.Category>

@Html.DevExpress().GridView(settings =>
    {
        settings.Name = "gvCategories";

        settings.CallbackRouteValues = new { Controller = "Category", Action = "CategoriesPartial" };

        settings.Width = 1200;

        settings.SettingsPager.Position = PagerPosition.TopAndBottom;
        settings.SettingsPager.FirstPageButton.Visible = true;
        settings.SettingsPager.LastPageButton.Visible = true;
        settings.SettingsPager.PageSizeItemSettings.Visible = true;
        settings.SettingsPager.PageSizeItemSettings.Items = new string[] { "10", "20", "50", "100", "200" };
        settings.SettingsPager.PageSize = 50;

        settings.Settings.ShowFilterRow = true;
        settings.Settings.ShowFilterRowMenu = true;

        settings.CommandColumn.Visible = true;
        settings.CommandColumn.ClearFilterButton.Visible = true;
        settings.CommandColumn.ShowSelectCheckbox = true;

        settings.Settings.ShowHeaderFilterButton = true;

        settings.KeyFieldName = "Id";

        settings.Columns.Add("Name");

        settings.SettingsEditing.AddNewRowRouteValues = new { Controller = "Category", Action = "CreateNew" };
        settings.SettingsEditing.UpdateRowRouteValues = new { Controller = "Category", Action = "Edit" };

        settings.SettingsEditing.Mode = GridViewEditingMode.Inline;

        settings.CommandColumn.Visible = true;
        settings.CommandColumn.NewButton.Visible = true;
        settings.CommandColumn.EditButton.Visible = true;
        settings.CommandColumn.UpdateButton.Visible = true;

    }).Bind(Model).GetHtml()

容器视图中的相关片段：[Index.cshtml]

@model IEnumerable<GlobalizationUI.BusinessObjects.Category>

@Html.Partial("_CategoriesPartial", Model)

<script type = "text/javascript">
//<![CDATA[
    $(document).ready(
        function () {
            WireHandlers();
        }
    );

    function DeleteCategories(selectedCategoriesArray) {

        if (selectedCategoriesArray.length == 0) return;

        debugger;

        var url = '/Category/Delete';

        $.ajax(url,
        {
            cache: false, async: false, type: 'POST',
            data: JSON.stringify({ categoryIds: selectedCategoriesArray }), dataType: 'json',
            contentType: 'application/json', traditional: true,
            error: OnError, success: OnSuccess
        });

        function OnSuccess(data, textStatus, jqXHR) {
            debugger;
        }

        function OnError(jqXHR, textStatus, errorThrown) {
        }
    }

    function DeleteSelectedCategories() {
        if (gvCategories.GetSelectedRowCount() == 0) return;

        gvCategories.GetSelectedFieldValues('Id', DeleteCategories);
    }

    function WireHandlers() {
        $('#btnDeleteCategory').unbind("click").click(DeleteSelectedCategories);
    }
// ]]>
</script>

我在 Windows 7 Home Premium 64 位机器上使用适用于 ASP.NET MVC 4 的 DevExpress Extensions v12.2.10.0。

4

1 回答 1

0

在回调到服务器后尝试调用 Grid 的客户端gvCategories.Refresh()方法。

如果这没有帮助，请将网格的GridViewSettings.EnableRowsCache属性值设置为false。

您还可以查看此线程（它描述了几乎相同的问题）：https ://www.devexpress.com/Support/Center/Question/Details/Q316778

于 2014-02-06T19:07:35.793 回答