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在有人回答这个问题之前，我在我的代码中发现了这个错误，并在下面发布了我的答案。我把这个问题留了下来（除非有人真的在乎）作为一个警示故事，以始终约束你的 bleepingGridView。

前言/背景

我（ab）以一种奇怪的方式使用 ASP.NET WebForms 控件。我知道。

我正在开发一个应用程序，希望学生列出他们参加过的一些学校活动。学生可以添加几行，并且——仅出于一般工作流程的原因——我决定将GridView显示他们“已保存”条目的行分开从他们添加/更新活动的“详细信息”区域。

编辑/更新作品精美。我可以添加新项目，使用绑定到我的类中的内置验证（这是所有具有属性的额外span标签显示的内容）。class="error"我真的很想让这个白痴证明，所以他们单击添加新活动的按钮也将验证并将他们的信息添加到GridView（如果项目通过验证），清除详细信息控件，并正常运行。

问题描述

我对此开始了一些基本测试，发现如果我编辑一个活动，打破该类中的一个（或多个）验证规则，然后单击“添加新活动”按钮，我GridView将该行从EditItemTemplate后面恢复到正常ItemTemplate。

据我所知，我EditIndex从未偏离我仍在编辑的行。事实上，如果我触发另一个回发，则GridView显示正确EditIndex！

我已经尝试重新设置EditIndex并切换我e.Cancel = true的return声明。什么都没奏效。考虑到EditIndex's值通过多次回发保持不变，我不得不认为这里发生了一些奇怪的事情。

我在下面发布了标记和 C# 代码。两者都非常荒谬 - 我重构了我的功能 - 所以我提前道歉，并感谢任何足够勇敢（或足够无聊）提供建议的人。

此外，如果有人愿意看到这种情况发生而不是（或除此之外）阅读我的标记/代码，我可以提供屏幕截图。

GridView

<asp:GridView ID="schoolActivities" AutoGenerateColumns="false" runat="server">
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:Button ID="edit" CommandName="Edit" runat="server" Text="Edit" />
            </ItemTemplate>
            <EditItemTemplate></EditItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField>
            <HeaderTemplate></HeaderTemplate>
            <ItemTemplate>
                <%# DataBinder.GetPropertyValue(Container.DataItem, "Details") %>
            </ItemTemplate>
            <EditItemTemplate>Editing...</EditItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField>
            <HeaderTemplate>
                Months per Year
            </HeaderTemplate>
            <ItemTemplate><%# DataBinder.GetPropertyValue(Container.DataItem, "MonthsPerYear") %></ItemTemplate>
            <EditItemTemplate></EditItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField>
            <HeaderTemplate>Date</HeaderTemplate>
            <ItemTemplate>
                <%# DataBinder.GetPropertyValue(Container.DataItem, "ActivityDate") %>
            </ItemTemplate>
            <EditItemTemplate></EditItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField>
            <HeaderTemplate>
                Total Hours Outside Class Time
            </HeaderTemplate>
            <ItemTemplate>
                <%# DataBinder.GetPropertyValue(Container.DataItem, "TotalHours") %>
            </ItemTemplate>
            <EditItemTemplate></EditItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

“详细信息”部分

<br />
<button type="button" id="newActivity" runat="server">Add New Activity</button>
<br />

<fieldset id="schoolActivityFields" runat="server" visible="false">
    <legend>Activity</legend>

    <span>Details:</span>
    <span>
        <textarea id="schoolActivityDetails" class="schoolActivityDetails" runat="server"></textarea>
        <br />
        <span id="schoolActivityDetailsError" class="error" runat="server"></span>
    </span>
    <br />

    <span>Months per Year:</span>
    <span>
        <select id="schoolActivityMonthsPerYear" runat="server">
            <option>1</option>
            <option>2</option>
            <option>3</option>
            <option>4</option>
            <option>5</option>
            <option>6</option>
            <option>7</option>
            <option>8</option>
            <option>9</option>
            <option>10</option>
            <option>11</option>
            <option>12</option>
        </select>
    </span>
    <span id="schoolActivityMonthsPerYearError" class="error" runat="server"></span>
    <br />

    <span>Date:</span>
    <span>
        <select id="schoolActivityDate" runat="server">
            <option>2005</option>
            <option>2006</option>
            <option>2007</option>
            <option>2008</option>
            <option>2009</option>
            <option>2010</option>
            <option>2011</option>
            <option>2012</option>
        </select>
    </span>
    <span id="schoolActivityDateError" class="error" runat="server"></span>
    <br />

    <span>Total Hours:</span>
    <span>
        <input type="text" id="schoolActivityTotalHours" runat="server" />
    </span>
    <span id="schoolActivityTotalHoursError" class="error" runat="server"></span>
    <br />

    <button type="button" id="addActivity" runat="server">Add Activity</button>
    <button type="button" id="updateActivity" runat="server" visible="false">Update Activity</button>
    <button type="button" id="cancelEditActivity" runat="server" visible="false">Cancel Editing Activity</button>
    <button type="button" id="deleteActivity" runat="server" visible="false">Delete Activity</button>
</fieldset>

C# 的长度很长，但对于任何勇敢的人来说：

void addActivity_ServerClick(object sender, EventArgs e)
{
    AddSchoolActivity();
}

private bool AddSchoolActivity()
{
    ResetSchoolActivityErrors();
    SchoolActivity activityToAdd = GetSchoolActivity();

    try
    {
        SessionApplication.SchoolActivities.Add(activityToAdd);

        BindSchoolActivities();
        ResetSchoolActivityFields();
        HideSchoolActivityFields();
    }
    catch (BrokenRuleException)
    {
        MapSchoolActivityErrors(activityToAdd);
        return false;
    }

    return true;
}

void updateActivity_ServerClick(object sender, EventArgs e)
{
    UpdateSchoolActivity();
}

private bool UpdateSchoolActivity()
{
    ResetSchoolActivityErrors();
    SchoolActivity activityToUpdate = GetSchoolActivity();

    try
    {
        SessionApplication.SchoolActivities[schoolActivities.EditIndex] = activityToUpdate;
        ResetSchoolActivitiesEditIndex();

        BindSchoolActivities();
        ResetSchoolActivityFields();
        HideSchoolActivityFields();
    }
    catch (BrokenRuleException)
    {
        MapSchoolActivityErrors(activityToUpdate);
        SetSchoolActivitiesEditIndex(schoolActivities.EditIndex);
        return false;
    }

    return true;
}

private SchoolActivity GetSchoolActivity()
{
    SchoolActivity currentActivity = new SchoolActivity();

    currentActivity.Details = schoolActivityDetails.Value;

    TryGetSchoolActivityMonthsPerYear(currentActivity);
    TryGetSchoolActivityDate(currentActivity);
    TryGetSchoolActivityTotalHours(currentActivity);

    return currentActivity;
}

private void TryGetSchoolActivityMonthsPerYear(SchoolActivity currentActivity)
{
    byte monthsPerYear;

    if (byte.TryParse(schoolActivityMonthsPerYear.Value, out monthsPerYear))
    {
        currentActivity.MonthsPerYear = monthsPerYear;
    }
}

private void TryGetSchoolActivityDate(SchoolActivity currentActivity)
{
    short activityDate = -1;

    if (short.TryParse(schoolActivityDate.Value, out activityDate))
    {
        currentActivity.ActivityDate = activityDate;
    }
}

private void TryGetSchoolActivityTotalHours(SchoolActivity currentActivity)
{
    short totalHours = -1;

    if (schoolActivityTotalHours.Value.IsNullOrWhiteSpace() == false
        && short.TryParse(schoolActivityTotalHours.Value, out totalHours))
    {
        currentActivity.TotalHours = totalHours;
    }
}

private void ResetSchoolActivityFields()
{
    schoolActivityDetails.Value = string.Empty;
    schoolActivityMonthsPerYear.SelectedIndex = 0;
    schoolActivityDate.SelectedIndex = 0;
    schoolActivityTotalHours.Value = string.Empty;
}

private void HideSchoolActivityFields()
{
    schoolActivityFields.Visible = false;
}

private void MapSchoolActivityErrors(int activityIndex)
{
    SchoolActivity updatedActivity = SessionApplication.SchoolActivities[activityIndex];

    MapSchoolActivityErrors(updatedActivity);
}

private void MapSchoolActivityErrors(SchoolActivity updatedActivity)
{
    foreach (RuleViolation currentViolation in updatedActivity.GetRuleViolations())
    {
        schoolActivityErrorMapping[currentViolation].InnerText = currentViolation.ErrorMessage;
    }
}

private void ResetSchoolActivityErrors()
{
    foreach (RuleViolation currentViolation in schoolActivityErrorMapping.Keys)
    {
        schoolActivityErrorMapping[currentViolation].InnerText = string.Empty;
    }
}

void schoolActivities_RowEditing(object sender, GridViewEditEventArgs e)
{
    if (schoolActivities.EditIndex != e.NewEditIndex
        && schoolActivities.EditIndex != -1)
    {
        ResetSchoolActivityErrors();
        SchoolActivity activityToUpdate = GetSchoolActivity();

        try
        {
            SessionApplication.SchoolActivities[schoolActivities.EditIndex] = activityToUpdate;
        }
        catch (BrokenRuleException)
        {
            MapSchoolActivityErrors(activityToUpdate);
            e.Cancel = true;
        }
    }

    if (e.NewEditIndex != -1)
    {
        SchoolActivity activityToEdit = SessionApplication.SchoolActivities[e.NewEditIndex];

        SetSchoolActivityFields(activityToEdit);
        ShowSchoolActivityFields();
        ShowModifyActivityButtons();
    }

    SetSchoolActivitiesEditIndex(e.NewEditIndex);
    BindSchoolActivities();
}

private void ShowModifyActivityButtons()
{
    addActivity.Visible = false;
    updateActivity.Visible = true;
    cancelEditActivity.Visible = true;
    deleteActivity.Visible = true;
}

private void SetSchoolActivityFields(SchoolActivity activityToEdit)
{
    schoolActivityDetails.Value = activityToEdit.Details;
    schoolActivityMonthsPerYear.Value = activityToEdit.MonthsPerYear.ToString();
    schoolActivityDate.Value = activityToEdit.ActivityDate.ToString();
    schoolActivityTotalHours.Value = activityToEdit.TotalHours.ToString();
}

private bool ShowSchoolActivityFields()
{
    return schoolActivityFields.Visible = true;
}

private void BindSchoolActivities()
{
    schoolActivities.DataSource = SessionApplication.SchoolActivities;
    schoolActivities.DataBind();
}

void newActivity_ServerClick(object sender, EventArgs e)
{
    if (SessionApplication.SchoolActivities.Count < SchoolActivityList.Rules.MaxCount)
    {
        if (schoolActivities.EditIndex != -1)
        {
            if (UpdateSchoolActivity() == false)
            {
                return;
            }
        }
        else if (schoolActivityFields.Visible)
        {
            if (AddSchoolActivity() == false)
            {
                return;
            }
        }

        ShowSchoolActivityFields();
        ShowAddActivityButtons();
    }
}

private void ShowAddActivityButtons()
{
    addActivity.Visible = true;
    updateActivity.Visible = false;
    cancelEditActivity.Visible = false;
    deleteActivity.Visible = false;
}

void ResetSchoolActivitiesEditIndex()
{
    SetSchoolActivitiesEditIndex(-1);
}

void SetSchoolActivitiesEditIndex(int rowIndex)
{
    schoolActivities.EditIndex = rowIndex;
}
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1 回答 1

0

叹。我错过了对绑定函数的调用。

UpdateSchoolActivity()应该是这样的：

private bool UpdateSchoolActivity()
{
    ResetSchoolActivityErrors();
    SchoolActivity activityToUpdate = GetSchoolActivity();

    try
    {
        SessionApplication.SchoolActivities[schoolActivities.EditIndex] = activityToUpdate;
        ResetSchoolActivitiesEditIndex();

        BindSchoolActivities();
        ResetSchoolActivityFields();
        HideSchoolActivityFields();
    }
    catch (BrokenRuleException)
    {
        MapSchoolActivityErrors(activityToUpdate);
        SetSchoolActivitiesEditIndex(schoolActivities.EditIndex);
        BindSchoolActivities(); // That little guy? Don't worry about that little guy.
        return false;
    }

    return true;
}
于 2012-07-20T16:57:37.360 回答