將數據庫中的值轉換爲整數時輸入字符串格式不正確

Question

將字符串從數據庫轉換爲整數時出現問題。

當我看看當地人，那個變量顯示的值，但通知仍然說有什麼問題。任何人都可以幫助我？

OleDbConnection kon = new OleDbConnection(koneksi); 
OleDbCommand command1 = kon.CreateCommand(); 

kon.Open(); 
string selectkoordgaris = "select * from koordinatgaris where namakamera = '" + PilihKameraComboBox.Text + "'"; 
command1.CommandText = selectkoordgaris; 
OleDbDataReader bacakoordgaris = command1.ExecuteReader(); 

while (bacakoordgaris.Read()) 
    {   
    var templateGaris = Directory.GetFiles(@"D:\Dokumen\Alfon\TA Alfon\CobaFitur\Template\Garis\" + bacakoord["namakamera"].ToString()); 

foreach (var fileGaris in templateGaris) 
{ 
    counterbanyakgaris++; 
    Image<Bgr, byte> garis = new Image<Bgr, byte>(fileGaris); 

    for (cntgaris = 0; cntgaris < banyakgaris; cntgaris++) 
    { 
     int x1garis = int.Parse(bacakoordgaris["x" + ((cntgaris * 4) + 1) + "garis"].ToString()); //here the error. It says Input string was not in a correct format 
     int x2garis = int.Parse(bacakoordgaris["x" + ((cntgaris * 4) + 2) + "garis"].ToString()); 
     int y1garis = int.Parse(bacakoordgaris["y" + ((cntgaris * 4) + 1) + "garis"].ToString()); 
     int y2garis = int.Parse(bacakoordgaris["y" + ((cntgaris * 4) + 2) + "garis"].ToString()); 
     int y3garis = int.Parse(bacakoordgaris["y" + ((cntgaris * 4) + 3) + "garis"].ToString()); 

     int gariswidth = x2garis - x1garis; 
     int garisheight = y3garis - y2garis; 
      } 
     } 
    } 

Answer 1

這是因爲bacakoordgaris["x" + ((cntgaris * 4) + 1) + "garis"]的輸出不是數字格式（它可能包含一些字符串）。

您可以將breakpoint添加到該行並添加監視以檢查從bacakoordgaris["x" + ((cntgaris * 4) + 1) + "garis"]返回的值，並在將其解析爲整數（例如，通過String.Replace（）方法）之前對其進行更正。