Question

警告1 变量“tPhone”在赋值前被使用。可能会在运行时导致空引用异常。是什么意思

While myReader.Read tID = myReader.GetInt32(0) tAddress = myReader.GetString(1) tPhone = myReader.GetString(2) tBankNumber = myReader.GetString(3) End While myConn.Close() MsgBox("客户编号：" & tID & Chr(10) & "客户姓名：" & Me.cbConCustomer.SelectedItem & Chr(10) & "客户电话：" & tPhone & Chr(10) & "客户地址：" & tAddress & Chr(10) & "银行账号：" & tBankNumber, MsgBoxStyle.Information, "提示信息：") Catch ex As Exception MsgBox(Err.Description) End Try

Answer 1

给tID，tAddress，tPhone，tBankNumber这些变量先赋一个初值