有没有一种方法可以调用某些服务器端代码；新的“；按钮被按下

在我的ASPxGridView上单击"edit"按钮时，将触发StartRowEditing事件。发生这种情况时，我会设置一个名为"IsEditing"的局部变量，这样当CellEditorIntialize触发时，我就可以为我的comboboxes设置数据源。我这样做是因为，如果用户按下cancel，CellEditorInitialize事件将再次触发，并且由于combobox不可用，我将得到一个空引用问题。

我需要对"new"按钮执行同样的操作，但没有"StartSrowInserting"事件。

有什么想法吗？

这是C#中的服务器代码。

这是StartRowEditingEvent:

protected void gvLocation_StartRowEditing(object sender, DevExpress.Web.Data.ASPxStartRowEditingEventArgs e)
    {
        this.IsEditing = true; //There's not editing property in this event, so everytime it fires, we'll set this flag to true
        if (e.Cancel) //And we'll only set the flag to false when canceling
            this.IsEditing = false;
    }

当我单击ASPxGridView上的"编辑"按钮时，会触发此事件。它会将该变量设置为true。如果用户正在取消对话框，则会将其设置为false。

然后，当控件初始化时，CellEditorInitialize事件将触发。

protected void gvLocation_CellEditorInitialize(object sender, DevExpress.Web.ASPxGridView.ASPxGridViewEditorEventArgs e)
    {
        e.Column.EditFormSettings.Visible = DevExpress.Utils.DefaultBoolean.False;
        if (this.IsEditing) //Only populate fields when editing
        {
            if (e.Column.FieldName == "LocationPK")
                e.Editor.Visible = false; //We don't want LocationPK to be updated
            else if (e.Column.FieldName == "ShalePlay")
            {
                ASPxComboBox combo = (ASPxComboBox)e.Editor;
                mcCommon.Setup(ref combo, true, LookupValuesShalePlay.List, "Description", "PK");
            }
            else if (e.Column.FieldName == "FieldType")
            {
                ASPxComboBox combo = (ASPxComboBox)e.Editor;
                mcCommon.Setup(ref combo, true, LookupValuesFieldType.List, "Description", "PK");
            }
            else if (e.Column.FieldName == "County")
            {
                ASPxComboBox combo = (ASPxComboBox)e.Editor;
                mcCommon.Setup(ref combo, true, LookupValuesCounty.List, "Description", "PK");
            }
            else if (e.Column.FieldName == "State")
            {
                ASPxComboBox combo = (ASPxComboBox)e.Editor;
                mcCommon.Setup(ref combo, true, LookupValuesState.List, "Description", "PK");
            }
            else
            {
            }
        }
    }

我确定哪个控件是哪个，并分配数据源。如果我不使用该标志，当用户取消编辑时，它将抛出一个null异常。当用户在插入时单击"新建"或"取消"时，也会触发此事件。但在CellEditorInitilize启动之前，我找不到在单击"新建"按钮时启动的事件。

因此，当用户单击"新建"answers"取消"按钮时，我需要一种设置标志的方法，这样我就可以设置标志。

这是ASPxGridView的标记。

<dx:ASPxGridView
ID="gvLocation"
runat="server"
AutoGenerateColumns="False"
DataSourceID="edsLocations"
ClientInstanceName="gvLocation"
ViewStateMode="Disabled"
KeyFieldName="LocationPK"
Width="600px"
OnCellEditorInitialize="gvLocation_CellEditorInitialize"
OnCommandButtonInitialize="gvLocation_CommandButtonInitialize"
OnStartRowEditing="gvLocation_StartRowEditing"
>
    <ClientSideEvents BeginCallback="
                    function(s, e) {loadingPanel.Show();}"
EndCallback="
                    function(s, e) {loadingPanel.Hide();}" />
<Columns>
    <dx:GridViewDataHyperLinkColumn FieldName="LocationPK" ReadOnly="True" VisibleIndex="0" Visible="false">
        <PropertiesHyperLinkEdit TextField="LocationPK" />
    </dx:GridViewDataHyperLinkColumn>
    <dx:GridViewDataTextColumn FieldName="LocationName" VisibleIndex="1">
         <DataItemTemplate>
            <a href="javascript:void(0);" onclick="gvLocation_LinkClick('<%# Container.VisibleIndex %>');"><%# DataBinder.Eval(Container.DataItem,"LocationName") %></a>
        </DataItemTemplate>
    </dx:GridViewDataTextColumn>
    <dx:GridViewDataComboBoxColumn FieldName="FieldType" VisibleIndex="2">
        <PropertiesComboBox TextField="FieldType" ValueField="FieldType" />
    </dx:GridViewDataComboBoxColumn>
    <dx:GridViewDataComboBoxColumn FieldName="State" VisibleIndex="4">
        <PropertiesComboBox ValueField="State" TextField="State" />
    </dx:GridViewDataComboBoxColumn>
    <dx:GridViewDataComboBoxColumn FieldName="CountyName" VisibleIndex="3">
        <PropertiesComboBox ValueField="CountyName" TextField="CountyName" ValueType="System.String" DataSourceID="edsCounty" />
    </dx:GridViewDataComboBoxColumn>
    <dx:GridViewDataComboBoxColumn FieldName="ShalePlay" VisibleIndex="5">
        <PropertiesComboBox ValueField="ShalePlay" TextField="ShalePlay" />
    </dx:GridViewDataComboBoxColumn>
    <dx:GridViewCommandColumn VisibleIndex="6">
        <EditButton Visible="True">
        </EditButton>
        <NewButton Visible="True">
        </NewButton>
    </dx:GridViewCommandColumn>
</Columns>
<Settings ShowFilterBar="Visible" ShowFilterRow="True" ShowGroupPanel="True" />
<SettingsBehavior AllowFocusedRow="True" />
<SettingsLoadingPanel Mode="Disabled" />