LINQ到實體無法識別方法「的Int32 ToInt32（System.String）」的方法，而這種方法不能被翻譯成店表達

Question

我得到這個錯誤，當我試試這個代碼：

TaxiEntities db = new TaxiEntities(); 
bool IsUserPassCorrected = db.tblOperators.Any(item => item.UserName.ToLower() == txtUserName.Text.ToLower() && 
item.Password == Convert.ToInt32(txtPassWord.Text)); 

if (!IsUserPassCorrected) 
{ 
    MessageBox.Show("Username or Password is incorrected! Please try again"); 
} 

Answer 1

由於LINQ到實體不支持Convert.ToInt32，你需要分析到int LINQ以外的第一：

TaxiEntities db = new TaxiEntities(); 
int password = int.Parse(txtPassWord.Text); 

bool IsUserPassCorrected = db.tblOperators 
      .Any(item => item.UserName.ToLower() == txtUserName.Text.ToLower() 
         && item.Password == password);