CREATE ASSEMBLY 失败 safe 程序集中不允许存储到静态字段

提示错误：

由于 safe 程序集 'SqlServerCLRCallNet' 中 'SqlServerCLRCallNet.TEST' 类型的方法 'CallSAPFunUpdateDataVB' 将存储到静态字段，CREATE ASSEMBLY 失败。
在 safe 程序集中不允许存储到静态字段

过程代码：

using System;
using System.Collections.Generic;
using System.Text;
using VBLib;

namespace SqlServerCLRCallNet
{
    public class TEST
    {
        private static string ApplicationServer = System.Configuration.ConfigurationManager.AppSettings["ApplicationServer"].ToString();
        private static string Client = System.Configuration.ConfigurationManager.AppSettings["Client"].ToString();
        private static string SystemNumber = System.Configuration.ConfigurationManager.AppSettings["SystemNumber"].ToString();

        public static DataSet CallSAPFunUpdateDataVB(string strFunName, ListDictionary strArgs, ListDictionary strTableArgs, ListDictionary strRetTabs, ref ListDictionary strResult)
        {
            VBSAP VBSap = new VBSAP(null, ApplicationServer, Client, SystemNumber.ToString());
            return null;
        }
    }
}

在SQL 中执行语句：提示以上错误

create assembly asmSqlServerCLRCallNet from'c:\SqlServerCLRCallNet.dll'

修改后：

using System;
using System.Collections.Generic;
using System.Text;

namespace SqlServerCLRCallNet
{
    public class GetConfigApp
    {
        public  string ApplicationServer = System.Configuration.ConfigurationManager.AppSettings["ApplicationServer"].ToString();
        public  string Client =  System.Configuration.ConfigurationManager.AppSettings["Client"].ToString();
        public  string Language =  System.Configuration.ConfigurationManager.AppSettings["Language"].ToString();
        public  string User =  System.Configuration.ConfigurationManager.AppSettings["User"].ToString(); 
        public  string Password = System.Configuration.ConfigurationManager.AppSettings["Password"].ToString(); 
        public  int SystemNumber =  int.Parse(System.Configuration.ConfigurationManager.AppSettings["SystemNumber"]); 


    }
}
View Code 
using System;
using System.Collections.Generic;
using System.Text;
using VBLib;

namespace SqlServerCLRCallNet
{
    public class TEST
    {
        

        public static DataSet CallSAPFunUpdateDataVB(string strFunName, ListDictionary strArgs, ListDictionary strTableArgs, ListDictionary strRetTabs, ref ListDictionary strResult)
        {
            GetConfigApp getConfig = new GetConfigApp();

            VBSAP VBSap = new VBSAP(null, getConfig.ApplicationServer, getConfig.Client, getConfig.SystemNumber);
            return null;
        }
    }
}