C＃的SqlCommand错误 [英] c# Sqlcommand error

问题描述

foreach (string str in TestWords)
{
  //spam
  SqlCommand cmd6 = new SqlCommand("select count from keys,files,folders where keys.fileid=files.id and keys.kname='" + str + "' and files.spam=1 and folders.id<>" + FolIter + " and files.folderid<>" + FolIter + " and files.id='" + s[0].ToString + "'", cn);
  int i6 = Convert.ToInt16(cmd6.ExecuteScalar());
  double temp = Convert.ToDouble((i6 + 1) / (i7 + i8));
  //non spam

  **error**

  SqlCommand cmd9 = new SqlCommand("select count from keys,files,folders where keys.fileid=files.id and keys.kname='" 
    + str 
    + "' and files.spam=0 and folders.id<>"
    + FolIter
    + " and files.folderid<>" 
    + FolIter 
    + " and files.id='" 
    + s[0].ToString 
    + "'", cn);
  int i9 = Convert.ToInt16(cmd9.ExecuteScalar());
  temp2 = Convert.ToDouble((i9 + 1) / (i7 + i8));
  Sdoc = Convert.ToDouble(Sdoc * temp);
  NsDoc = Convert.ToDouble(NsDoc * temp2);
}

错误IAM越来越是：运算符'+'不能应用于类型为串和方法组

推荐答案

您正使用方法的ToString（）为地产

变更 S [0]的ToString - > S [0]的ToString（）

记住C＃不允许这样做。

Remember C# does not allow it.

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