绑定到自定义控件中的事件时，命令事件不会触发

Question

我正在编写一个自定义控件来显示登录表单。 “登录”按钮应该根据它实现的页面执行不同的操作。因此，在页面代码隐藏中，我试图设置控件中包含的登录按钮的Command事件来触发在页面代码隐藏。表单和所有内容都可以正常显示，但单击“登录”按钮时，事件不会触发。

非常感谢任何有关Command事件未被解雇的想法，谢谢！

控制代码“LoginForm.cs”

public enum LoginFormType
{
    /// <summary>
    /// Standard.
    /// </summary>
    [Description("Standard")]
    Standard = 0,

    /// <summary>
    /// Customer Manager.
    /// </summary>
    [Description("Customer Manager")]
    CustomerManager = 1,
}

public class LoginForm : Panel
{
    public bool ShowInstructions = true;
    public bool ShowForgotPassword = true;
    public bool ShowRegisterLink = false;
    public LoginFormType FormType = LoginFormType.Standard;

    // inputs
    public TextBox UsernameBox = new TextBox();
    public TextBox PasswordBox = new TextBox();

    // buttons
    public Button LoginButton = new Button();
    public Button ForgotPasswordButton = new Button();

    // wrappers (<p> tags)
    private HtmlGenericControl _InstructionsWrapper = new HtmlGenericControl("p");
    private HtmlGenericControl _UsernameLabelWrapper = new HtmlGenericControl("p");
    private HtmlGenericControl _UsernameBoxWrapper = new HtmlGenericControl("p");
    private HtmlGenericControl _PasswordLabelWrapper = new HtmlGenericControl("p");
    private HtmlGenericControl _PasswordBoxWrapper = new HtmlGenericControl("p");
    private HtmlGenericControl _ButtonsWrapper = new HtmlGenericControl("p");
    private HtmlGenericControl _RegisterWrapper = new HtmlGenericControl("p");

    // literals (text)
    private Literal _Instructions = new Literal();
    private Literal _UsernameLabel = new Literal();
    private Literal _PasswordLabel = new Literal();
    private Literal _Register = new Literal();
    private Literal _Spacer = new Literal();

    // panels
    private Panel _Errors = new Panel();

    public LoginForm()
    {
        // IDs of dynamically added controls need to be declared here for scope
        this._InstructionsWrapper.ID = "LoginFormInstructionsWrapper";
        this._UsernameLabelWrapper.ID = "LoginFormUsernameLabelWrapper";
        this._UsernameBoxWrapper.ID = "LoginFormUsernameBoxWrapper";
        this._PasswordLabelWrapper.ID = "LoginFormPasswordLabelWrapper";
        this._PasswordBoxWrapper.ID = "LoginFormPasswordBoxWrapper";
        this._ButtonsWrapper.ID = "LoginFormButtonsWrapper";
        this._RegisterWrapper.ID = "LoginFormRegisterLinkWrapper";
        this.UsernameBox.ID = "LoginFormUsernameBox";
        this.PasswordBox.ID = "LoginFormPasswordBox";
        this.LoginButton.ID = "LoginFormLoginButton";
        this.ForgotPasswordButton.ID = "LoginFormForgotPasswordButton";
    }

    public void DisplayError(string errorMessage)
    {
        Literal message = new Literal();
        message.Text = errorMessage;

        this._Errors.Controls.Add(message);
    }

    protected override void OnPreRender(EventArgs e)
    {
        base.CreateChildControls();

        // element spacer
        this._Spacer.Text = "&nbsp;";

        // instructions
        if (this.ShowInstructions)
        {
            this._Instructions.Text = LoginFormResources.Instructions;
            this._InstructionsWrapper.Controls.Add(this._Instructions);
            this.Controls.Add(this._InstructionsWrapper);
        }

        // username label
        this._UsernameLabel.Text = LoginFormResources.Username;
        this._UsernameLabelWrapper.Controls.Add(this._UsernameLabel);
        this.Controls.Add(this._UsernameLabelWrapper);

        // username box
        this._UsernameBoxWrapper.Controls.Add(this.UsernameBox);
        this.Controls.Add(this._UsernameBoxWrapper);

        // password label
        this._PasswordLabel.Text = LoginFormResources.Password;
        this._PasswordLabelWrapper.Controls.Add(this._PasswordLabel);
        this.Controls.Add(this._PasswordLabelWrapper);

        // password box
        this.PasswordBox.TextMode = TextBoxMode.Password;
        this._PasswordBoxWrapper.Controls.Add(this.PasswordBox);
        this.Controls.Add(this._PasswordBoxWrapper);

        // buttons
        this.LoginButton.Text = LoginFormResources.Login;
        this._ButtonsWrapper.Controls.Add(this.LoginButton);

        if (this.ShowForgotPassword)
        {
            this._ButtonsWrapper.Controls.Add(this._Spacer);
            this.ForgotPasswordButton.Text = LoginFormResources.ForgotPassword;
            this._ButtonsWrapper.Controls.Add(this.ForgotPasswordButton);
        }

        this.Controls.Add(this._ButtonsWrapper);

        // errors panel placeholder
        this.Controls.Add(this._Errors);

        // register link
        if (this.ShowRegisterLink && this.FormType != LoginFormType.CustomerManager)
        {
            this._Register.Text = String.Format(LoginFormResources.Register, "<a href=\"register.aspx\">", "</a>");
            this.Controls.Add(this._Register);
        }

        base.OnPreRender(e);
    }
}

Page Codebehind“Default.cs”

public class Default : CustomerManagerPage
{
    public Content BreadcrumbContent = new Content();
    public Content PageContent = new Content();

    public Label Breadcrumb = new Label();

    public LoginForm LoginFormControl = new LoginForm();

    public Panel ForgotPasswordModal = new Panel();
    public ModalPopupExtender ForgotPasswordMPE = new ModalPopupExtender();

    protected override void OnInit(EventArgs e)
    {
        base.OnInit(e);
    }


    public void Page_Load(object sender, EventArgs e)
    {

        LoginFormControl.FormType = LoginFormType.CustomerManager;
        LoginFormControl.ShowInstructions = true;
        LoginFormControl.ShowRegisterLink = true;
        LoginFormControl.LoginButton.Command += new CommandEventHandler(this._LoginButton_Command);


        _BuildForgotPasswordModal();


        if (IsPostBack)
        { }
    }

    private void _LoginButton_Command(object sender, CommandEventArgs e)
    {
        Response.Write("FIRED");
        /*
        try
        {
            Library.Login.AuthenticateUser(LoginFormControl.UsernameBox.Text, LoginFormControl.PasswordBox.Text);

            Response.Redirect("/");
        }
        catch (Exception ex)
        {
            LoginFormControl.DisplayError(ex.Message);
        }
        */
    }

    private void _BuildForgotPasswordModal()
    {
        this.ForgotPasswordMPE.ID = "ForgotPasswordMPE";

        // header
        Panel header = new Panel();
        Label headerTitle = new Label();

        headerTitle.ID = "ModalHeaderTitle";
        headerTitle.Text = "Confirm";


        header.ID = "ModalHeader";
        header.CssClass = "ModalHeader";

        header.Controls.Add(headerTitle);

        // body
        Label forgotPasswordText = new Label();
        TextBox usernameBox = new TextBox();
        Button forgotPasswordSubmitButton = new Button();
        Button cancelButton = new Button();
        Panel body = new Panel();
        Panel hr = new Panel();

        forgotPasswordText.ID = "ForgotPasswordText";
        forgotPasswordText.Text = "<p>Enter your username in the box below, then click 'Submit'.</p> <p>Your password will be reset and emailed to the email address associated with your account.</p>";

        usernameBox.ID = "ForgotPasswordUsername";

        forgotPasswordSubmitButton.ID = "ForgotPasswordSubmit";
        forgotPasswordSubmitButton.Text = "Submit";

        cancelButton.ID = "ForgotPasswordCancel";
        cancelButton.Text = "Cancel";
        cancelButton.OnClientClick = "javascript:$find('" + ForgotPasswordMPE.ClientID + "').hide(); return false;";

        hr.ID = "ModalHr";
        hr.CssClass = "ModalHr";

        body.ID = "ModalBody";
        body.CssClass = "ModalBody";

        body.Controls.Add(forgotPasswordText);
        body.Controls.Add(usernameBox);
        body.Controls.Add(hr);
        body.Controls.Add(forgotPasswordSubmitButton);
        body.Controls.Add(cancelButton);

        // modal
        this.ForgotPasswordModal.Controls.Add(header);
        this.ForgotPasswordModal.Controls.Add(body);

        // modal properties
        this.ForgotPasswordModal.ID = "ForgotPasswordModal";
        this.ForgotPasswordModal.CssClass = "ModalContainer";

        // modal popup extender
        this.ForgotPasswordMPE.TargetControlID = this.LoginFormControl.ForgotPasswordButton.ClientID;
        this.ForgotPasswordMPE.PopupControlID = this.ForgotPasswordModal.ID;
        this.ForgotPasswordMPE.OkControlID = forgotPasswordSubmitButton.ID;
        this.ForgotPasswordMPE.CancelControlID = cancelButton.ID;
        this.ForgotPasswordMPE.BackgroundCssClass = "ModalBackground";
    }
}

“的Default.aspx”

<% @ Page Language="C#" AutoEventWireup="true" Inherits="MyApplication.CustomerManager.Pages.Default" %>

<asp:Content ID="BreadcrumbContent" ContentPlaceHolderID="BreadcrumbContentPlaceholder" runat="server">
    <asp:Label ID="Breadcrumb" runat="server" />
</asp:Content>

<asp:Content ID="PageContent" ContentPlaceHolderID="PageContentPlaceholder" runat="server">
    <asp:ScriptManager ID="asm" runat="server" EnableScriptLocalization="true" EnableScriptGlobalization="true" />
    <ctrls:LoginForm ID="LoginFormControl" runat="server" />
    <asp:Panel ID="ForgotPasswordModal" runat="server"></asp:Panel>
    <atk:ModalPopupExtender ID="ForgotPasswordMPE" runat="server" />
</asp:Content>

更新：问题已解决！

答案不是生命周期，而是与生命周期有关。

首先，让控件继承自Panel（作为一种在div中呈现它的懒惰方式）是不对的。我将其更改为继承WebControl并将：base（HtmlTextWriterTag.Div）添加到构造函数中，以便它在div中呈现。这是修复的一小部分。

此问题的实际解决方法是让控件也继承INamingContainer。这是最重要的部分，显然有必要让控制儿童提出回发事件。

此修复的第一部分仅是必要的，因为即使在继承INamingContainer之后，它仍然无效。但是在更改它以继承WebControl和INamingContainer之后，它才起作用。仍然不太确定为什么我不能继承Panel和INamingContainer，但在这一点上我不确定我是否足够仔细研究它。