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using Microsoft.SharePoint;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;

namespace ConsoleApplication2
{
    class Program
    {
        // SetCustomProperty GetCustomProperty在2013中无法使用，需要用下面的替换函数来执行
        static void Main(string[] args)
        {

            SPSite site = new SPSite("http://svr0813:81");
            SPWeb web = site.OpenWeb();
            SPField field = web.Fields.GetField("测试");
            SetFieldAttribute(field, "unitName", "吨");
            field.Update();
            var ss = GetFieldAttribute(field,"unitName");

            Console.ReadKey();
        }
        static void SetFieldAttribute(object oo,string attribute, string value)
        {
            Type baseType;
            BindingFlags flags;
            MethodInfo mi;
            baseType = typeof(SPField);
            flags = BindingFlags.Instance | BindingFlags.NonPublic;
            mi = baseType.GetMethod("SetFieldAttributeValue", flags);
            mi.Invoke(oo, new object[] { attribute, value });
        }

        static string GetFieldAttribute(object oo ,string attribute)
        {
            Type baseType;
            BindingFlags flags;
            MethodInfo mi;
            baseType = typeof(SPField);
            flags = BindingFlags.Instance | BindingFlags.NonPublic;
            mi = baseType.GetMethod("GetFieldAttributeValue",
                                        flags,
                                        null,
                                        new Type[] { typeof(String) },
                                        null);
            object obj = mi.Invoke(oo, new object[] { attribute });
            if (obj == null)
                return "";
            else
                return obj.ToString();
        }
    }
}