求高手帮忙改下错误

Question

 double[] a1 = new double[1000];    
                    string mylinea1 = " ";
                    StreamReader myReadera1 = new StreamReader(@"D:\360Downloads\新建文件夹\201209\surface\plot\12083108.000", Encoding.GetEncoding("GB2312"));
                    int j = 0;
                    while ((mylinea1 = myReadera1.ReadLine()) != null)
                    {
                        
                        mylinea1 = mylinea1.Replace("  ", " ");
                        mylinea1 = mylinea1.Replace("   ", " ");
                        mylinea1 = mylinea1.Replace("  ", " ");
                        string [] sArraya1 = mylinea1.Split(' ');
                        for (j = 1; j < 1000;j++ )
                        {
                            if (sArraya1[0] = Convert.ToString(53513)) //这一行出错，说无法将类型string隐式转换为bool
                              
                            {
                                a1[0] = Convert.ToDouble(sArraya1[5]);
                                
                            }
                        }                     
                        
                    }
                   求高手解答

Answer 1

sArraya1[0] == Convert.ToString(53513)

Answer 2

  if (sArraya1[0] == Convert.ToString(53513))

Answer 3

这个程序读不起来求解答
数据是 
13586   21.65   41.97  239   32    0    0    0  176    6    0    0
      0 9999    0 9999    5.1   20.0    0   15.2 9999 9999    1    2 9999 9999
68906   -9.87  -40.34   54   32    6  230    3  249    8    0    0
      0   32    6  600   -1.7   9999    0    3.6   20   10    1    2 9999 9999
89004   -9.74  -74.19 1440   32 9999  130   13  952    3 9999 9999
      0 9999 9999 9999  -26.7   9999 9999  -21.8 9999 9999    1    2 9999 9999
78858  -62.67   17.30   48   32    1   40    6  162 9999    0    0
      0   38    1  600   23.1   29.0    0   27.0   20   12    1    2 9999 9999
个样子
程序是double[] a1 = new double[1000];    
                    string mylinea1 = " ";
                    StreamReader myReadera1 = new StreamReader(@"D:\360Downloads\新建文件夹\201209\surface\plot\12083108.000", Encoding.GetEncoding("GB2312"));
                    int j = 0;
                    mylinea1 = myReadera1.ReadLine();
                    mylinea1 = myReadera1.ReadLine();
                    while ((mylinea1 = myReadera1.ReadLine()) != null)
                    {
                        j=j+1;
                        mylinea1 = mylinea1.Replace("  ", " ");
                        mylinea1 = mylinea1.Replace("   ", " ");
                        mylinea1 = mylinea1.Replace("  ", " ");
                        string [] sArraya1 = mylinea1.Split(' ');
                       
                    if (sArraya1[0] == Convert.ToString（53513））                             
                            {
                                a1[0] = Convert.ToDouble(sArraya1[5]);
                                
                            }
                       }                     
                        但是读不出来，求解答