自定义复杂类型转换器（TypeConverter）错误，请大家帮忙看看

DBXP 2010-06-17 10:26:32

请朋友们帮忙看看我的转换器问题出在哪里，谢谢各位！

我使用 System.ComponentModel.TypeConverter 实现了一个服务器控件的自定义复杂类型属性转换器，错误信息如下：
分析器错误
说明: 在分析向此请求提供服务所需资源时出错。请检查下列特定分析错误详细信息并适当地修改源文件。

分析器错误消息: 无法为“www.Class1”类型的值生成代码。试图为 mypro 生成属性值时出现此错误。

aspx页面代码如下：

<%@ Page Language="C#" AutoEventWireup="true" %>

<%@ Register assembly="www" namespace="www" tagprefix="cc1" %>

<script runat="server">

    protected void Page_Load(object sender, EventArgs e)

    {

        string s = www.String2ObjectTypeConverter.Object2String(new Class1());

        this.TextBox1.Text = s;

        object o = www.String2ObjectTypeConverter.String2Object(s);

    }

</script>

<html xmlns="http://www.w3.org/1999/xhtml">

<body>

    <form id="form1" runat="server">

    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

    <cc1:WebCustomControl1 ID="WebCustomControl1" runat="server" mypro="AAEAAAD/////AQAAAAAAAAAMAgAAADp3d3csIFZlcnNpb249MC4wLjAuMCwgQ3VsdHVyZT1uZXV0cmFsLCBQdWJsaWNLZXlUb2tlbj1udWxsBQEAAAAKd3d3LkNsYXNzMQIAAAAVPG5hbWU+a19fQmFja2luZ0ZpZWxkFDxhZ2U+a19fQmFja2luZ0ZpZWxkAQAIAgAAAAYDAAAAAk9LCgAAAAs=" />



    </form>

</body>

</html>

自定义服务器控件和相关转换器代码如下：

namespace www

{

    [System.ComponentModel.DefaultProperty("Text")]

    [System.Web.UI.ToolboxData("<{0}:WebCustomControl1 runat=server></{0}:WebCustomControl1>")]

    public class WebCustomControl1 : System.Web.UI.WebControls.WebControl

    {

        [System.ComponentModel.TypeConverter(typeof(String2ObjectTypeConverter))]

        public Class1 mypro

        {

            get;

            set;

        }



        protected override void RenderContents(System.Web.UI.HtmlTextWriter output)

        {

            output.Write("Demo");

        }

    }



    public class String2ObjectTypeConverter : System.ComponentModel.TypeConverter

    {

        /// <summary>

        /// 将对象序列化为一个字符串。

        /// </summary>

        /// <param name="o"></param>

        /// <returns></returns>

        public static string Object2String(object o)

        {

            using (System.IO.MemoryStream ms = new System.IO.MemoryStream())

            {

                System.Runtime.Serialization.Formatters.Binary.BinaryFormatter fmt = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();

                fmt.Serialize(ms, o);

                byte[] bytes = ms.ToArray();

                return System.Convert.ToBase64String(bytes);

            }

        }



        /// <summary>

        /// 从字符串还原对象。

        /// </summary>

        /// <param name="str"></param>

        /// <returns></returns>

        public static object String2Object(string str)

        {

            using (System.IO.MemoryStream ms = new System.IO.MemoryStream())

            {

                System.Runtime.Serialization.Formatters.Binary.BinaryFormatter fmt = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();

                byte[] bytes = System.Convert.FromBase64String(str);

                ms.Write(bytes, 0, bytes.Length);

                ms.Seek(0, System.IO.SeekOrigin.Begin);

                return fmt.Deserialize(ms);

            }

        }



        public override bool CanConvertFrom(System.ComponentModel.ITypeDescriptorContext context, System.Type sourceType)

        {

            if (sourceType == typeof(string))

            {

                return true;

            }



            return base.CanConvertFrom(context, sourceType);

        }



        public override bool CanConvertTo(System.ComponentModel.ITypeDescriptorContext context, System.Type destinationType)

        {

            if (destinationType == typeof(string))

            {

                return true;

            }

            else if (destinationType == typeof(System.ComponentModel.Design.Serialization.InstanceDescriptor))

            {

                return true;

            }



            return base.CanConvertTo(context, destinationType);

        }



        public override object ConvertFrom(System.ComponentModel.ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)

        {

            if (value is string)

            {

                return String2Object(value.ToString());

            }



            return base.ConvertFrom(context, culture, value);

        }



        public override object ConvertTo(System.ComponentModel.ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, System.Type destinationType)

        {

            if (destinationType == typeof(string))

            {

                return Object2String(value);

            }

            else if (destinationType == typeof(System.ComponentModel.Design.Serialization.InstanceDescriptor) && (value is Class1))

            {

                return new System.ComponentModel.Design.Serialization.InstanceDescriptor(typeof(Class1).GetConstructor(new System.Type[] { typeof(string) }), new string[] { Object2String(value) });

            }



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

        }



    }



    [System.Serializable]

    [System.ComponentModel.TypeConverter(typeof(String2ObjectTypeConverter))]

    public class Class1

    {

        public string name

        {

            get;

            set;

        }



        public int age

        {

            get;

            set;

        }



        public Class1()

        {

            this.name = "OK";

            this.age = 10;

        }



        public Class1(string name, int age)

        {

            this.name = name;

            this.age = age;

        }



        public new string ToString()

        {

            return this.name;

        }

    }



}