C# 单击按钮时引发System.FormatException，但程序在单击OK-WPF后打开

我输入姓名、通用密码和密码，当我单击“登录”时，我得到一个系统。格式异常：输入字符串的格式不正确。但是，单击“确定”后，我打算打开的窗口将被打开。我如何摆脱异常。异常表示错误被抛出到这堆代码中：

`private void ShowEmployeeRank1()
        {
            // use a try-catch, in case we run into an
            // error while digging into the database
            try
            {
                // create a query and select everything from the EmployeeRankq table
                string query = "select * from EmployeeRank1";

                // the SqlDataAdapter can be imagined like an
                // Interface to make tables usable by C# objects

                // create a connection to the database and run the query
                SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(query, sqlConnection);

                // use the sqlDataAdapter
                using (sqlDataAdapter)
                {
                    // create a new DataTable that allows us
                    // to store data from tables within objects
                    DataTable employeeRank1Table = new DataTable();

                    // fill the sqlDataAdapter with all the
                    // information from the query(from the employeeRank1Table)
                    sqlDataAdapter.Fill(employeeRank1Table);

                    // set the content of the employeeRank1List
                    // to be "Name" from the table "EmployeeRank1"
                    employeeRank1List.DisplayMemberPath = "Name";

                    // set the value of a specific item
                    // of listEmployeeRank1 to be "Id" from "EmployeeRank1" table
                    employeeRank1List.SelectedValuePath = "Id";

                    // set the content in the employeeRank1List to be the
                    // content of the EmployeeRank1 table in a DefaultView mode
                    employeeRank1List.ItemsSource = employeeRank1Table.DefaultView;
                }
            }
            catch (Exception e)
            {
                // show what is the error
                MessageBox.Show(e.ToString());
            }
        }

---

更具体地说，这行代码：

employeeRank1List.ItemsSource=employeeRank1Table.DefaultView
这修复了异常，但现在我在EmployeeRank1表的列表框中的记录不再可见。因为该建议没有意义。拆下ToString。对于您的问题，请尝试提供一个。您是否尝试将datatable设置为源而不是defaultview？例如：
employeeRank1List.ItemsSource=employeeRank1Table；您没有进行任何筛选，为什么要使用defaultview？还有，employeeRank1List是什么类型的对象？@zaggler刚刚尝试过，抛出了一个错误-它们属于不同的类型。事实上，我在进行过滤，我试图显示表中的某一列，而不是全部。EmployeeRank1列表是一个列表框。@Clemens谢谢，我需要更多地关注评论：），我已经准备好周末了，看起来。。。