我通过谷歌搜索，发现很多人都在努力解决这个问题，但我仍然没有找到正确的答案。
http://i.stack.imgur.com/15jen.png
我有一个表单视图，需要检查语言代码是否重复，必须检查服务器端脚本，因为它需要通过数据库进行检查。
2011 年 5 月 4 日更新，19.32 // 我在这里添加了表单视图的属性，所以如果有什么问题，有人可能会指出。
<asp:FormView ID="fmvxLanguage" runat="server" EnableViewState="False" DefaultMode="Insert"
Visible="False" Width="95%" DataSourceID="odsLanguage" DataKeyNames="LanguageCode"
CssClass="formViewAdd">
//
<dxe:ASPxButton ID="btnAddNewLanguage" runat="server" CausesValidation="True"
Image-Url="~/images/icon/Save-icon.png" CommandName="Insert" Text="Save">
</dxe:ASPxButton>
我使用插入命令作为插入按钮，原因验证设置为真。
<asp:CustomValidator ID="cvdLanguageCodeNameDuplicate" runat="server"
ControlToValidate="txtLanguageCode" CssClass="IconValidation"
ErrorMessage="<img src="/images/icon/validation-Icon.png"/> Language code name is duplicated."
onservervalidate="cvdLanguageCodeNameDuplicate_ServerValidate"> </asp:CustomValidator>
自定义验证器设置如上
当我单击按钮并尝试在 serverValidate 事件中放置断点时，我什至没有到达那里
protected void cvdLanguageCodeNameDuplicate_ServerValidate(object source, ServerValidateEventArgs args)
{
if (LanguageHelper.HaveLanguageCode(args.Value))
{
args.IsValid = false;
}
}
至于现在，我使用标签而不是自定义验证器，方法是检查事件 FormView_ItemInserting 中的值是否有效，如果值无效，我只需使用 e.Cancel (FormViewInsertEventArgs) 并使标签可见。但是，我仍然想知道自定义验证器是否不适用于 formview 或者我做错了什么。
谢谢你。
以下代码与问题无关，但它可能对搜索此主题的人有用并且可能有相同的问题。我必须重复很多次，所以我为这个事件创建了可重用的类（使用标签作为验证器）
public class clsFormViewDuplicationValidationSetter
{
#region Property
public FormView FormView { get; set; }
public delegate bool DelDuplicationValidationNameOnly(string pStrName);
public delegate bool DelDuplicationValidationNameAndId(string pStrName, int primaryId);
public DelDuplicationValidationNameOnly DuplicationValidationNameOnly;
public DelDuplicationValidationNameAndId DuplicationValidationDelegationNameAndId;
public TextBox TextBoxNameToCheckForDuplication { get; set; }
public Label LabelDuplicationValidationMessage { get; set; }
#endregion
#region Constructor
/// <summary>
/// Pattern For Simple Duplication ValidationName and Id
/// </summary>
/// <param name="pObjFormView">FormView</param>
/// <param name="pObjTextBoxNameToCheckForDuplication">TextBoxName</param>
/// <param name="pObjLabelDuplicationValidationMessage">Lable Showing Error Message</param>
/// <param name="pObjDuplicationValidationNameAndId">Delegation for validation function (name and id)</param>
public clsFormViewDuplicationValidationSetter(FormView pObjFormView, TextBox pObjTextBoxNameToCheckForDuplication, Label pObjLabelDuplicationValidationMessage, DelDuplicationValidationNameAndId pObjDuplicationValidationNameAndId)
{
this.FormView = pObjFormView;
this.TextBoxNameToCheckForDuplication = pObjTextBoxNameToCheckForDuplication;
this.LabelDuplicationValidationMessage = pObjLabelDuplicationValidationMessage;
this.DuplicationValidationDelegationNameAndId = pObjDuplicationValidationNameAndId;
FormView.ItemInserting += new FormViewInsertEventHandler(FormView_ItemInserting);
}
/// <summary>
/// Pattern For Simple Duplication Validation Name
/// </summary>
/// <param name="pObjFormView">FormView</param>
/// <param name="pObjTextBoxNameToCheckForDuplication">TextBoxName</param>
/// <param name="pObjLabelDuplicationValidationMessage">Lable Showing Error Message</param>
/// <param name="pObjDuplicationValidationDelegation">Delegation for validation function (name)</param>
public clsFormViewDuplicationValidationSetter(FormView pObjFormView, TextBox pObjTextBoxNameToCheckForDuplication, Label pObjLabelDuplicationValidationMessage, DelDuplicationValidationNameOnly pObjDuplicationValidationNameOnly)
{
this.FormView = pObjFormView;
this.TextBoxNameToCheckForDuplication = pObjTextBoxNameToCheckForDuplication;
this.LabelDuplicationValidationMessage = pObjLabelDuplicationValidationMessage;
this.DuplicationValidationNameOnly = pObjDuplicationValidationNameOnly;
FormView.ItemInserting += new FormViewInsertEventHandler(FormView_ItemInserting);
}
void FormView_ItemInserting(object sender, FormViewInsertEventArgs e)
{
string name = TextBoxNameToCheckForDuplication.Text;
bool IsDuplicate;
// when adding, id always 0
if (DuplicationValidationDelegationNameAndId != null)
IsDuplicate = DuplicationValidationDelegationNameAndId(name, 0);
else
IsDuplicate = DuplicationValidationNameOnly(name);
if (IsDuplicate)
{
e.Cancel = true;
FormView.Visible = true;
LabelDuplicationValidationMessage.Visible = true;
}
}
#endregion
}
在表单加载中使用时
protected void Page_Load(object sender, EventArgs e)
{
TextBox objtxtLanguageCode= (TextBox)fmvxLanguage.FindControl("txtLanguageCode");
Label objFormViewLabelDuplicationValidationMessage = (Label)fmvxLanguage.FindControl("lblFormViewDuplicate");
clsFormViewDuplicationValidationSetter objFormViewDuplicationValidationSetter = new clsFormViewDuplicationValidationSetter(fmvxLanguage,objtxtLanguageCode,objFormViewLabelDuplicationValidationMessage,LanguageHelper.HaveLanguageCode);
}