2

我在这个问题上陷入了严重的项目中间。谷歌了很多，但没有得到解决方案。

我的目标是创建一个带有标签、文本框、两个必填字段验证器和一个自定义验证器的复合控件。我的自定义控制代码如下：-

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace AFGISServerControl
{
    [ToolboxData("<{0}:ValidatorTextBox runat="\""server\"> </{0}:ValidatorTextBox>")]
    public class ValidatorTextBox : CompositeControl
    {
        private TextBox InputTextBox;
        private Label InputLabel;
        private RequiredFieldValidator RequiredValidator1;
        private RequiredFieldValidator RequiredValidator2;
        private CustomValidator cv;
        private static readonly object EventValidateKey = new object();

        protected override void OnLoad(EventArgs e)
        {
            EnsureChildControls();
            base.OnLoad(e);
        }
        protected override void CreateChildControls()
        {
            Controls.Clear();
            InputTextBox = new TextBox();
            InputLabel = new Label();
            InputTextBox.ID = "inputTextBox";
            //InputTextBox.AutoPostBack = true;

            RequiredValidator1 = new RequiredFieldValidator();
            RequiredValidator1.ID = this.ID + "_RFV1";
            RequiredValidator1.ControlToValidate = InputTextBox.ID;
            RequiredValidator1.ValidationGroup = string.Empty;
            RequiredValidator1.Display = ValidatorDisplay.Dynamic;
            RequiredValidator1.ErrorMessage = Caption.ToString() + " is mandatory";

            RequiredValidator2 = new RequiredFieldValidator();
            RequiredValidator2.ID = this.ID + "_RFV2";
            RequiredValidator2.ControlToValidate = InputTextBox.ID;
            RequiredValidator2.Display = ValidatorDisplay.Dynamic;
            RequiredValidator2.ErrorMessage = Caption.ToString() + " is mandatory";

            cv = new CustomValidator();
            cv.ID = this.ID + "_CV";
            cv.ControlToValidate = InputTextBox.ID;
            cv.SetFocusOnError = true;
            cv.Display = ValidatorDisplay.Dynamic;
            cv.ErrorMessage = this.CustomErrorMessage;
            cv.ValidateEmptyText = true;
            cv.ServerValidate += new System.Web.UI.WebControls.ServerValidateEventHandler(this.cv_ServerValidate);

            this.Controls.Add(InputLabel);
            this.Controls.Add(InputTextBox);
            this.Controls.Add(RequiredValidator1);
            this.Controls.Add(RequiredValidator2);
            this.Controls.Add(cv);
        }

        #region properties
        [
        Bindable(true),
        Category("Default"),
        DefaultValue(""),
        Description("Value")
        ]
        public string Text
        {
            get
            {
                EnsureChildControls();
                return InputTextBox.Text;
            }
            set
            {
                EnsureChildControls();
                InputTextBox.Text = value;
            }
        }
        [
        Bindable(true),
        Category("Default"),
        DefaultValue(""),
        Description("Validation Group")
        ]
        public string ValidationGroup
        {
            get
            {
                EnsureChildControls();
                return InputTextBox.ValidationGroup;
            }
            set
            {
                EnsureChildControls();
                InputTextBox.ValidationGroup = value;
                RequiredValidator2.ValidationGroup = value;
                cv.ValidationGroup = value;
            }
        }
        [
        Bindable(true),
        Category("Default"),
        DefaultValue(""),
        Description("Error message for the custom validator.")
        ]
        public string CustomErrorMessage
        {
            get
            {
                EnsureChildControls();
                return cv.ErrorMessage;
            }
            set
            {
                EnsureChildControls();
                cv.ErrorMessage = value;
            }
        }
        [
        Bindable(true),
        Category("Default"),
        DefaultValue(""),
        Description("Validity of custom validator.")
        ]
        public Boolean isValid
        {
            get
            {
                EnsureChildControls();
                return cv.IsValid;
            }
            set
            {
                EnsureChildControls();
                cv.IsValid = value;
            }
        }

        [
        Bindable(true),
        Category("Default"),
        DefaultValue(""),
        Description("The text for the name label.")
        ]
        public string Caption
        {
            get
            {
                EnsureChildControls();
                return InputLabel.Text;
            }
            set
            {
                EnsureChildControls();
                InputLabel.Text = value;
            }
        }
        #endregion

        protected override void RecreateChildControls()
        {
            EnsureChildControls();
        }

        [
        Category("Action"),
        Description("Raised on Text Change")
        ]
        public event ServerValidateEventHandler Validate
        {
            add
            {
                Events.AddHandler(EventValidateKey, value);
            }
            remove
            {
                Events.RemoveHandler(EventValidateKey, value);
            }
        }
        protected virtual void OnValidate(ServerValidateEventArgs args)
        {
            EventHandler ValidateHandler = (EventHandler)Events[EventValidateKey];
            if (ValidateHandler != null)
            {
                ValidateHandler(this, args);
            }
        }
        protected void cv_ServerValidate(object source, ServerValidateEventArgs args)
        {
            OnValidate(args);
        }

        protected override void Render(HtmlTextWriter writer)
        {
            AddAttributesToRender(writer);
            InputLabel.RenderControl(writer);
            InputTextBox.RenderControl(writer);
            RequiredValidator1.RenderControl(writer);
            RequiredValidator2.RenderControl(writer);
            cv.RenderControl(writer);
        }        
    }
}

我的 aspx 代码是

    <cc1:ValidatorTextBox ID="ValidatorTextBox1" runat="server" Caption="Service No"
        CustomErrorMessage="Not Valid" ValidationGroup="test" 
        OnValidate="CVText" />
    <asp:Button ID="Button1" runat="server" Text="Button" />

aspx.cs

面临的具体问题是

  • 未触发“onvalidate”事件的代码隐藏方法
  • 必填字段验证器错误消息仅显示“是必需的”，标题没有前缀。

我会很感激你的建议。

4

2 回答 2

0

一些东西：

  • 您需要在源代码控制上调用 Page.Validate() 或使用 CausesValidation=true 触发回发。确保在执行验证时未指定 ValidationGroup 或使用“测试”ValidationGroup。
  • 在 CreateChildControls 期间正在设置必填字段验证器。您的标题是从输入文本中提取的，直到初始化后才会填充。您的 CreateChildControls 可能在加载 ViewState 之前发生。您可能希望使用 JavaScript 设置 RequiredFieldValidator 文本，或者使用 _TextChanged 事件处理程序在文本更改时更新错误消息。您采用的方法显然取决于您的特定用例要求。
于 2012-11-01T18:25:25.777 回答
0

在打破头之后，我改变了使用这个控件的整个方式。继续使用验证器。这是一个相当有效的方法。

于 2012-11-16T19:44:13.067 回答