从code后面添加错误消息，验证摘要 [英] Adding error message to validation summary from code behind

问题描述

我在做类似下面在Web窗体应用程序;

I am doing something like below on a web forms application;

protected void button_transfer_search_Click(object sender, EventArgs e) {

    Page.Validate("val1");

    if (!Page.IsValid && int.Parse(txtArrivalDateTrf.Text) + 5 < 10) {
        return;
    }

另外，我有我的aspx文件如下code;

also, I have following code on my aspx file;

<div class="search-engine-validation-summary">
    <asp:ValidationSummary ValidationGroup="transfer" runat="server" ShowMessageBox="false" />
</div>

我的问题是如何添加一个错误信息页面返回之前，这样验证摘要可以抓住这一点，显示它。我知道我们可以在MVC中很容易地做到这一点，但我还没有想出怎么做，在网页表单。谢谢！

my question is how to add an error message to the page before return so that validation summary can grab that and displays it. I know we can do this in mvc easily but I haven't figured out how to do that in web forms. thanks !

推荐答案

每当我发现这种情况，这是我做的：

Whenever I find this situation this is what I do:

var val = new CustomValidator()
{
   ErrorMessage = "This is my error message.",
   Display = ValidatorDisplay.None,
   IsValid = false,
   ValidationGroup = vGroup
};
val.ServerValidate += (object source, ServerValidateEventArgs args) => 
   { args.IsValid = false; };
Page.Validators.Add(val);

在我的ASPX code我有一个ValidationSummary控件使用的ValidationGroup设置为相同的值 vGroup 。

然后，我已经装尽可能多的CustomValidators（或任何其他类型的验证器）由codebehind后，我想我只需拨打

Then, after I have loaded as many CustomValidators (or any other kind of validators) by codebehind as I want I simply call

Page.Validate()
if (Page.IsValid)
{
    //... set your valid code here
}

到 Page.Validate（）呼叫调用所有code-后面插入验证器的拉姆达联的方法，如果任何虚假返回页面无效，有没有执行code返回。否则，该页面会返回一个有效的值，并执行有效的code。

The call to Page.Validate() calls the lambda-linked method of all code-behind inserted validators and if any returns false the page is invalid and returned with no code executed. Otherwise, the page returns a valid value, and executes the valid code.

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