好像是配置文件的问题。

见下面链接 　　http://www.codeproject.com/KB/XML/remotingsimpleeng.aspx

A. Oh yes... You would need to consider some things when using this code in v1.1 of the framework... You need to add a property called typeFilterLevel to the formatter tag and set it to Full to relax security, or else, you'll get an exception:

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System.Security.SecurityException.
 Type System.DelegateSerializationHolder and the types derived from it (such
 as System.DelegateSerializationHolder) are not permitted to be deserialized
 at this security level.
 System.Runtime.Serialization.SerializationException
 Because of security restrictions,
 the type System.Runtime.Remoting.ObjRef cannot

 be accessed.

Be sure to change your config file (on the server):

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<configuration>
<system.runtime.remoting>
<channel ref="http" port="7777">
<serverProviders>
<provider ref="wsdl" />
<formatter ref="soap" typeFilterLevel="Full" />
<formatter ref="binary" typeFilterLevel="Full" />
</serverProviders>
<clientProviders>
<formatter ref="binary" />
</clientProviders>
</channel>
<service>
<!-- ... Add your services here ... -->
</service>
</system.runtime.remoting>
</configuration>

and client:

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<configuration>
<system.runtime.remoting>
<channel ref="http" port="0">
<clientProviders>
<formatter ref="binary" />
</clientProviders>
<serverProviders>
<formatter ref="binary" typeFilterLevel="Full" />
</serverProviders>
</channel>
<client>
<!-- ... Add your classes here ... -->
</client>
</system.runtime.remoting>
</configuration>

For more details on how to do it programmatically, please refer to this link.