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格式化single保留两位小数:string.ToString("f2")
c++ float类型对应C#的single类型
C++Unit16[],flost[] 对应C#数组:
 [MarshalAs(UnmanagedType.ByValArray, SizeConst = 5)]
        public UInt16[] Retained;              //留存数(登录人数);对应数据留存率天数,1,3,7,30,60;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 5)]
        public Single[] rate;		           //留存率  对应数据留存率天数,1,3,7,30,60;
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原文地址:http://www.cnblogs.com/xxxiaoxiong/p/5048707.html