c# - '); 附近的语法不正确

Question

我的代码有错误。

代码执行直接流向 catch block 并说:incorrect syntax near ');

我想在数据库中保存一个文件，然后再调用。

public partial class newsrv : System.Web.UI.Page{
    string dir = "C://fileup//";

    protected void Page_Load(object sender, EventArgs e){
        if (!Directory.Exists(dir)){
            Directory.CreateDirectory(dir);
        }
    }

    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e){

    }

    protected void Button1_Click(object sender, EventArgs e){
        SqlConnection con = new SqlConnection("Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|DB.mdf;Integrated Security=True;User Instance=True");
        string fname = FileUpload1.PostedFile.FileName;
        try{
            SqlCommand cmd = new SqlCommand("INSERT INTO OrderNum (SrviceType, Msg,[File]) VALUES ('" + DropDownList1.SelectedItem.Text + "','" + TextBox1.Text + "' ,'" + FileUpload1.PostedFile.FileName + "') );", con);
            con.Open();

            try {
                int res = cmd.ExecuteNonQuery();
                if (res > 0){
                    System.Windows.Forms.MessageBox.Show("success");
                }
                Label2.Text = TextBox1.Text;
                FileUpload1.SaveAs(dir + fname);
                Label1.Text = " file name uploaded succ ";
                FileUpload1.Visible = true;
            }catch (Exception ex){
                System.Windows.Forms.MessageBox.Show(ex.Message);
            }
        }catch{
            Label1.Text = " file name  not uploaded  ";
            FileUpload1.Visible = false;
            con.Close();
        }finally{
            con.Close();
        }
    }

    protected void TextBox1_TextChanged(object sender, EventArgs e){

    }
}

Answer 1

看起来你在 SQL 语句的末尾有一个额外的 );...

... + TextBox1.Text + "' ,'" + FileUpload1.PostedFile.FileName + "') );", con);

                                                                     ^^ 
                                                                     remove these