string bookRequestNum = txtBookRequestNum.Text.Trim();
string bookIsbnNum = txtBookIsbnNum.Text.Trim();
sql = " insert into [Lib_BookBase] values (null,'" + bookIsbnNum +"','" + bookBarcode + "','" + bookRequestNum + "','" + bookIdentityNum + "','" + bookBaseLocation + "','" + bookPrice + "',0,'" + bookState + "','" + today.ToString("yyyy-MM-dd HH:mm:ss") + "','" + bookRecord + "')";
提示:sql = " insert into [Lib_BookBase] values (null,'" + bookIsbnNum +"','" + bookBarcode + "'
是错误 运算符“+”无法应用于“string”和“方法组”类型的操作数
这个编译器是不是疯了?
一类型的变量,可以加下划线区别:如
Data_selstr,Data_updatstr、Data_insertstrCode_bookBar、Code_bookbuy、Code_bookseal 等
这段代码也出现上面的问题,不知道怎么解决了