有关C#中List<T>方面的问题，期待老师们帮助解决。

Question

编程环境为：VC#2010+Access2010。编程中定义了如下类：

public class  ZlGcl_XtCs

{

public string    Mc;

      public int      GsGjx;                                                                     

      public int      GjxZ;                                                                      

      public int[]     GjxG = new int[101];                                                         

      public int[]     GjxC = new int[101];                                                       

      public double[]  GjxSl = new double[101];                                                    

      public int       GsGjxF;                                                                    

      public int       GjxFZ;                                                                     

      public int[]      GjxFG = new int[101];                                                       

      public int[]      GjxFC = new int[101];                                                      

      public double[]   GjxFSl = new double[101];                                                  

      public double[]   PGJ1 = new double[6];                                                      

      public double[]   PGJ2 = new double[6];                                                      

      public double    Lwg;                                                                      

      public double    Qtgj;                                                                     

      public double    Gb;                                                                    

      public int       Tlx;                                                                     

      public double[]  TSL = new double[6];                                                   

      public double[]  BwgSl = new double[12];                                                 

      public double[]  TpgSl = new double[12];                                               

      public long[]    BbwgSl = new long[4];                                                     

      public long[]    OvmSl = new long[30];                                                         

      public double[]  BmSl = new double[4];                                                     

      public long      Ygm;                                                                       

      public int       TFZMS;                                                                     

      public double[]   FzmsSl = new double[5];                                                     

      public int        PzTlx;                                                                     

      public double[]   QmPz = new double[3];                                                        

 }       

 

public static List<ZlGcl_XtCs> Data_ZlGcl = new List<ZlGcl_XtCs>();

 

程序片段：

 

for (j = 1; j < 5; j++)

{

    ZlGcl_XtCs  zlgcl = Data_ZlGcl[j];                 // Data_ZlGcl[j]已在前面使用Add进行了赋值处理

    dr.Read();                                         //从Access2010数据库读取数据

    zlgcl.PzTlx = Convert.ToInt16(dr["数据"]);         //"数据"为Access2010数据库字段名

    dr.Read();

    zlgcl.QmPz[0] = Convert.ToDouble(dr["数据"]);

    dr.Read();

    zlgcl.QmPz[1] = Convert.ToDouble(dr["数据"]);

    dr.Read();

    zlgcl.QmPz[2] = Convert.ToDouble(dr["数据"]);

    Data_ZlGcl[j] = zlgcl;                   

}     

 

现在奇怪的是：当循环体只一次时（即j=1，或者该语句片段不在循环体内），Data_ZlGcl[j] = zlgcl; 语句不会出现异常。当循环次数超过二次以上时，则最后一次循环时的zlgcl值语句会把前面几次的Data_ZlGcl[j] 值都赋予与末次zlgcl值相同。 我初次使用C#语言编程，想了又想，一直没找出原因。请哪位路过老师见到了给予指点，不胜感激！

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guo302

Answer 1

j=1开始？故意的吗？Data_ZlGcl[0]已经特殊处理过了？

 

对于你的问题我是这样理解的：

假设循环3次，第二次循环后数据是

Data_ZlGcl[1].PzTlx=1

Data_ZlGcl[1].QmPz={1,2,3}

Data_ZlGcl[2].PzTlx=2

Data_ZlGcl[2].QmPz={0,1,2}

第三次循环后，

Data_ZlGcl[1].PzTlx=3

Data_ZlGcl[1].QmPz={5,5,5}

Data_ZlGcl[2].PzTlx=3

Data_ZlGcl[2].QmPz={5,5,5}

Data_ZlGcl[3].PzTlx=3

Data_ZlGcl[3].QmPz={5,5,5}

即之前的数据都被覆盖了。

 

你可以试试不用 zlgc变量，直接 Data_ZlGcl[j].QmPz=×××这样来操作，看看有没有问题。

Answer 2

dear

因为你的执行个体被你改掉了，用等号并不会直接建立新的执行个体

请参考

http://www.dotblogs.com.tw/yc421206/archive/2011/06/17/28785.aspx

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秘訣無它，唯勤而已 http://www.dotblogs.com.tw/yc421206/

Answer 3

谢谢“爱让一切都对了”和余小章俩先生在百忙之中予以解答，但“爱让一切都对了”方法肯定不行。余老师所言错误应该是对的，由于我是初次涉及C#环境，困惑之处就是具体如何实现。还请老师指点啊。

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guo302

Answer 4

您可以试一下这种方法。

   List<ZlGcl_XtCs> lca = new List<ZlGcl_XtCs>();
            ZlGcl_XtCs[] clsss = new ZlGcl_XtCs[5];//初始化的大小
            int i = 0;
            while (dr.Read())
            {
                clsss[i] = new ZlGcl_XtCs();
                clsss[i].PzTlx= = Convert.ToInt16(dr["数据"]);  
                lca.Add(clsss[i]);
                i++;
            }

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Best Regards,
Rocky Yue[MSFT]
MSDN Community Support | Feedback to us
Get or Request Code Sample from Microsoft
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Answer 5

Tank You,Mr. Rocky Yue!OK!

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guo302

Answer 6

Tank You,Mr. Rocky Yue!OK!

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guo302

You are welcome.

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Best Regards,
Rocky Yue[MSFT]
MSDN Community Support | Feedback to us
Get or Request Code Sample from Microsoft
Please remember to mark the replies as answers if they help and unmark them if they provide no help.