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是否可以用GridView中的图像替换ButtonField?

buttonfield asp.net c#

0

Mark Allison · 技术社区 · 14 年前

我有一个GridView,它有一个删除链接来删除记录。我已经创建了一个DeleteButtonField类,但是我想用图像(图标)替换文本。这可能吗?这是我的网格视图:

<asp:GridView 
    ID="GridView1" 
    runat="server"
    <.. removed dome properties ..> 
    >
    <Columns>
    <CustomControls:DeleteButtonField ConfirmText="Delete this record?" /> 
    <.. other columns ..>
    </Columns>
</asp:GridView>

using System;
using System.Web.UI.WebControls;

namespace CustomControls
{
    public class DeleteButtonField : ButtonField
    {
        private string _confirmText = "Delete this record?";

        public string ConfirmText
        {
            get { return _confirmText; }
            set { _confirmText = value; }
        }

        public DeleteButtonField()
        {
            this.CommandName = "Delete";
            this.Text = "Delete";
            this.ImageUrl = "App_GlobalResources/Del.png";   // doesn't work
        }

        public override void InitializeCell(DataControlFieldCell cell, DataControlCellType cellType, DataControlRowState rowState, int rowIndex)
        {
            base.InitializeCell(cell, cellType, rowState, rowIndex);
            if (cellType == DataControlCellType.DataCell)
            {
                WebControl button = (WebControl)cell.Controls[0];
                button.Attributes["onclick"] = String.Format("return confirm('{0}');", _confirmText);
            }
        }
    }
}

这可能吗?如您所见,我向DeleteButtonField.cs类添加了以下代码,但没有任何效果: this.ImageUrl = "App_GlobalResources/Del.png";

谢谢。

2 回复 | 直到 14 年前

1

Brian Minnich 14 年前

让我们放弃覆盖按钮字段的想法,使用一个简单的模板字段。它将正确处理post back并引发GridView的(RowCommand&RowDeleting)事件。希望这有帮助!=)

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


namespace MyExample.Web
{
    public class MyDeleteButtonField : TemplateField
    {
        #region Properties

        private string _ConfirmText = "Delete Me?";
        public string ConfirmText
        {
            get { return _ConfirmText; }
            set { _ConfirmText = value; }
        }

        private string _ImageUrl = "~/Assets/Images/Buttons/flip.png";
        public string ImageUrl
        {
            get { return _ImageUrl; }
            set { _ImageUrl = value; }
        }

        #endregion

        #region Methods

        public override bool Initialize(bool sortingEnabled, System.Web.UI.Control control)
        {
            base.ItemTemplate = new MyTemplate(this.ConfirmText, this.ImageUrl);
            return base.Initialize(sortingEnabled, control);
        }

        #endregion

        #region Template

        public class MyTemplate : ITemplate
        {
            private string _ConfirmText;
            private string _ImageUrl;

            public MyTemplate(string confirmText, string imageUrl)
            {
                _ConfirmText = confirmText;
                _ImageUrl = imageUrl;
            }

            void ITemplate.InstantiateIn(Control container)
            {
                ImageButton bt = new ImageButton();
                bt.CommandName = "Delete";
                bt.ImageUrl = _ImageUrl;
                bt.ImageAlign = ImageAlign.AbsMiddle;
                bt.AlternateText = "Delete Me";
                bt.OnClientClick = String.Format("return confirm('{0}');", _ConfirmText);
                container.Controls.Add(bt);

            }
        }

        #endregion

    }
}

2

1

Scott Mitchell 14 年前

马克,我觉得你的定制课非常非常接近。对于 ButtonField 类以显示需要同时指定 ImageUrl 财产设置 ButtonType 属性到 ButtonType.Image

尝试更新您的 DeleteButtonField 类的构造函数:

public DeleteButtonField()
{
    this.CommandName = "Delete";
    this.Text = "Delete";
    this.ImageUrl = "App_GlobalResources/Del.png";
    this.ButtonType = ButtonType.Button;
}

.aspx 页码:

<CustomControls:DeleteButtonField ConfirmText="Delete this record?" ImageUrl='...' ButtonType="Image" />

编程愉快!