扩展ASP.NET MEMBERSHIP权限功能(三 )之权限控件

　　在上一篇中我们完成的简易的框架，这一篇中主要是如何制作权限按钮的控件（新增，编辑，删除，打印）

　　(效果图)

　　由PermissionsButton.cs、ButtonItem.cs、ButtonItemConverter.cs组成

　　1.PermissionsButton.cs 继存 WebControl类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
using System.ComponentModel;
using System.Web.UI;
using System.Security.Permissions;
using System.Web.UI.WebControls;
using System.Drawing.Design;
using System.ComponentModel.Design;

namespace EC.Permissions.WebControls
{
    /// <summary>
    /// 菜单按钮控件
    /// </summary>
    [
    AspNetHostingPermission(SecurityAction.Demand,
        Level = AspNetHostingPermissionLevel.Minimal),
    AspNetHostingPermission(SecurityAction.InheritanceDemand,
        Level = AspNetHostingPermissionLevel.Minimal),
    DefaultProperty("Buttons"),
    ParseChildren(true, "Buttons"),
    ToolboxData("<{0}:PermissionsButton runat=\"server\"> </{0}:PermissionsButton>"),
    PersistenceMode(PersistenceMode.InnerDefaultProperty),
    Description("菜单按钮控件")
    ]
    public class PermissionsButton :WebControl
    {
        public string TemplateStr = "<div>{0}</div>";
        private List<ButtonItem> buttons;

        public PermissionsButton()
        {
            buttons = new List<ButtonItem>();
        }

        protected override void Render(HtmlTextWriter w)
        {
            w.Write(TemplateStr, AddButtonToHtml());
            base.RenderContents(w);
        }

        /// <summary>
        /// 按钮集合
        /// </summary>
        [
        Category("Behavior"),
        Description("按钮集合"),
        Editor(typeof(CollectionEditor), typeof(UITypeEditor)),
        PersistenceMode(PersistenceMode.InnerDefaultProperty)
        ]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]

        public List<ButtonItem> Buttons { get { return buttons; } }

        private string AddButtonToHtml()
        {

            StringBuilder sb = new StringBuilder();
            sb.Append("<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\"><tr>");
            foreach (ButtonItem button in Buttons)
            {
                if (DAL.CheckButton(button.Type))
                {
                    sb.Append("<td>");
                    sb.AppendFormat(@"<input type='button' value='{0}'>", button.Text);
                    sb.Append("</td>");
                }

            }
            sb.Append("</tr></table>");
            return sb.ToString();
        }
    }
}

　　2. ButtonItem.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;

namespace EC.Permissions.WebControls
{
    [TypeConverter(typeof(ButtonItemConverter)), Description("按钮集合")]
    public class ButtonItem
    {
        public ButtonItem()
            : this(String.Empty, PermissionType.LIST, true)
        {
        }

        public ButtonItem(string caption, PermissionType type, bool visible)
        {
            this.Text = caption;
            this.Type = type;
            this.Visible = visible;
        }

        [Category("Behavior"), DefaultValue("按钮"), Description("按钮名称"), Browsable(true), NotifyParentProperty(true)]
        public string Text { get; set; }

        [Category("Behavior"), DefaultValue(true), Description("是否显示"), NotifyParentProperty(true)]
        public bool Visible { get; set; }

        [Category("Behavior"), DefaultValue(""), Description("功能类型"), NotifyParentProperty(true)]
        public PermissionType Type { get; set; }
    }
}

　　3. ButtonItemConverter.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;
using System.Globalization;

namespace EC.Permissions.WebControls
{
    public class ButtonItemConverter : ExpandableObjectConverter
    {
        #region 方法
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
        {
            if (sourceType == typeof(string))
            {
                return true;
            }
            return base.CanConvertFrom(context, sourceType);
        }

        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
        {
            if (destinationType == typeof(string)) { return true; }
            return base.CanConvertTo(context, destinationType);
        }

        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
        {
            if (value == null) { return new ButtonItem(); }

            if (value is string)
            {
                string s = (string)value;
                if (s.Length == 0) { return new ButtonItem(); }
                return "ButtonItem";
            }
            return base.ConvertFrom(context, culture, value);
        }

        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
        {
            if (value != null) { if (!(value is ButtonItem)) { throw new ArgumentException("Invalid ButtonItem", "value"); } }
            if (destinationType == typeof(string)) { if (value == null) { return String.Empty; } return ((ButtonItem)value).Text; }

            return base.ConvertTo(context, culture, value, destinationType);
        }
        #endregion
    }
}

最后在webroot的web.config

中添加

页面引用 Default.aspx

        <cc1:PermissionsButton ID="PermissionsButton1" runat="server" >
            <cc1:ButtonItem Text="新增" Type="ADD"/>
            <cc1:ButtonItem Text="编辑" Type="EDIT" />
        </cc1:PermissionsButton>

　　插入SQL Your RoleId请替换成你现有的RoleId

　　INSERT INTO [aspnet_Ex_PermissionsForRoles](RoleId,ModulePath,PermissionValue) Values('Your RoleId','/Admin/Test/default.aspx',26)
　　INSERT INTO [aspnet_Ex_PermissionsForRoles](RoleId,ModulePath,PermissionValue) Values('Your RoleId','/Admin/Test/ok.aspx',26)

　　运行页面效果如下

　　将26改为8

　　注数字来源于

    /// <summary>
    /// 权限类型
    /// </summary>
    public enum PermissionType
    {
        ALL=0,
        LIST=2,
        VIEW=4,
        ADD=8,
        EDIT=16,
        DELETE=32,
        PRINT=64
    }

　　!删除按钮没有了

　　将8改为32(DELETE)

　　按钮不见

　　完

　　下一篇扩展ASP.NET MEMBERSHIP权限功能(三 )之页面权限

　　扩展ASP.NET MEMBERSHIP权限功能(四 )之页面权限
　　扩展ASP.NET MEMBERSHIP权限功能(三 )之权限控件
　　扩展ASP.NET MEMBERSHIP权限功能(二 )
　　扩展ASP.NET MEMBERSHIP权限功能(一 )