Question

正如标题所示，我在WPF中更新数据网格时遇到了问题。基本上我要完成的是一个数据网格，它连接到SQL Server数据库，一旦用户将信息输入到几个文本框并单击提交按钮，它就会自动更新。你会注意到我有一个连接两个表的命令。来自Quote_Data表的数据将在稍后由其他用户插入。现在我唯一关心的是从文本框和General_Info表中获取信息，并从那里获取信息到我的数据网格中。我将在下面包含的代码编译得很好，但是当我点击提交按钮时，没有任何反应。这是我用SQL数据库构建的第一个应用程序，因此很多这些概念对我来说都是新的，这就是为什么你可能会查看我的代码并想知道他在想什么。

    public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    public DataSet mds; // main data set (mds)

    private void Window_Loaded_1(object sender, RoutedEventArgs e)
    {
        try
        {
            string connectionString = Sqtm.Properties.Settings.Default.SqtmDbConnectionString;

            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();

                //Merging tables General_Info and Quote_Data
                SqlCommand cmd = new SqlCommand("SELECT General_Info.Quote_ID, General_Info.Open_Quote, General_Info.Customer_Name,"
                                            + "General_Info.OEM_Name, General_Info.Qty, General_Info.Quote_Num, General_Info.Fab_Drawing_Num, "
                                            + "General_Info.Rfq_Num, General_Info.Rev_Num,  Quote_Data.MOA, Quote_Data.MOQ, "
                                            + "Quote_Data.Markup, Quote_Data.FOB, Quote_Data.Shipping_Method, Quote_Data.Freight, "
                                            + "Quote_Data.Vendor_Price, Unit_Price, Quote_Data.Difference, Quote_Data.Vendor_NRE_ET, "
                                            + "Quote_Data.NRE, Quote_Data.ET, Quote_Data.STI_NET, Quote_Data.Mfg_Time, Quote_Data.Delivery_Time, "
                                            + "Quote_Data.Mfg_Name, Quote_Data.Mfg_Location "
                                            + "FROM General_Info INNER JOIN dbo.Quote_Data ON General_Info.Quote_ID = Quote_Data.Quote_ID",
                                            connection);

                SqlDataAdapter da = new SqlDataAdapter(cmd);

                DataTable dt = new DataTable();

                da.Fill(dt);

                MainGrid.ItemsSource = dt.DefaultView;

                mds = new DataSet();

                da.Fill(mds, "General_Info");

                MainGrid.DataContext = mds.Tables["General_Info"];
            }
        }

        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }

        // renaming column names from the database so they are easier to read in the datagrid

        MainGrid.Columns[0].Header = "#";
        MainGrid.Columns[1].Header = "Date";
        MainGrid.Columns[2].Header = "Customer";
        MainGrid.Columns[3].Header = "OEM";
        MainGrid.Columns[4].Header = "Qty";
        MainGrid.Columns[5].Header = "Quote Number";
        MainGrid.Columns[6].Header = "Fab Drawing Num";
        MainGrid.Columns[7].Header = "RFQ Number";
        MainGrid.Columns[8].Header = "Rev Number";
        MainGrid.Columns[9].Header = "MOA";
        MainGrid.Columns[10].Header = "MOQ";
        MainGrid.Columns[11].Header = "Markup";
        MainGrid.Columns[12].Header = "FOB";
        MainGrid.Columns[13].Header = "Shipping";
        MainGrid.Columns[14].Header = "Freight";
        MainGrid.Columns[15].Header = "Vendor Price";
        MainGrid.Columns[16].Header = "Unit Price";
        MainGrid.Columns[17].Header = "Difference";
        MainGrid.Columns[18].Header = "Vendor NRE/ET";
        MainGrid.Columns[19].Header = "NRE";
        MainGrid.Columns[20].Header = "ET";
        MainGrid.Columns[21].Header = "STINET";
        MainGrid.Columns[22].Header = "Mfg. Time";
        MainGrid.Columns[23].Header = "Delivery Time";
        MainGrid.Columns[24].Header = "Manufacturer";
        MainGrid.Columns[25].Header = "Mfg. Location";

    }

    private void submitQuotebtn_Click(object sender, RoutedEventArgs e)
    {
        CustomerData newQuote = new CustomerData();

        int quantity;
        quantity = Convert.ToInt32(quantityTxt.Text);

        string theDate = System.DateTime.Today.Date.ToString("d");

        newQuote.OpenQuote = theDate;
        newQuote.CustomerName = customerNameTxt.Text;
        newQuote.OEMName = oemNameTxt.Text;
        newQuote.Qty = quantity;
        newQuote.QuoteNumber = quoteNumberTxt.Text;
        newQuote.FdNumber = fabDrawingNumberTxt.Text;
        newQuote.RfqNumber = rfqNumberTxt.Text;
        newQuote.RevNumber = revNumberTxt.Text;

        try
        {
            string insertConString = Sqtm.Properties.Settings.Default.SqtmDbConnectionString;

            using (SqlConnection insertConnection = new SqlConnection(insertConString))
            {
                insertConnection.Open();

                SqlDataAdapter adapter = new SqlDataAdapter(Sqtm.Properties.Settings.Default.SqtmDbConnectionString, insertConnection);

                SqlCommand updateCmd = new SqlCommand("UPDATE General_Info " + "Quote_ID = @Quote_ID, "
                                                    + "Open_Quote = @Open_Quote, " + "OEM_Name = @OEM_Name, " + "Qty = @Qty, "
                                                    + "Quote_Num = @Quote_Num, " + "Fab_Drawing_Num = @Fab_Drawing_Num, "
                                                    + "Rfq_Num = @Rfq_Num, " + "Rev_Num = @Rev_Num "
                                                    + "WHERE Quote_ID = @Quote_ID");

                updateCmd.Connection = insertConnection;

                System.Data.SqlClient.SqlParameterCollection param = updateCmd.Parameters;

                //
                // Add new SqlParameters to the command.
                //
                param.AddWithValue("Open_Quote", newQuote.OpenQuote);
                param.AddWithValue("Customer_Name", newQuote.CustomerName);
                param.AddWithValue("OEM_Name", newQuote.OEMName);
                param.AddWithValue("Qty", newQuote.Qty);
                param.AddWithValue("Quote_Num", newQuote.QuoteNumber);
                param.AddWithValue("Fab_Drawing_Num", newQuote.FdNumber);
                param.AddWithValue("Rfq_Num", newQuote.RfqNumber);
                param.AddWithValue("Rev_Num", newQuote.RevNumber);

                adapter.UpdateCommand = updateCmd;

                adapter.Update(mds.Tables[0]);

                mds.AcceptChanges();
            }
        }

        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }

    }

提前感谢任何可以提供帮助的人，我真的很感激，

安德鲁

Answer 1

您没有设置Quote_ID参数。因此，您的更新可能正在运行WHERE Quote_ID = null，因此无需更新。

Answer 2

您是要尝试更新现有行还是插入新行？

如果您需要插入，则正确的命令是insert（不更新）要获取插入行的标识值，请使用Scope_Identity()。

而且你一次只能插入一张桌子。

Scope_Identity()不是一个参数不要试图将它用作参数

见下面的例子

INSERT INTO Sales.Customer ([TerritoryID],[PersonID]) VALUES (8,NULL);
GO
SELECT SCOPE_IDENTITY() AS [SCOPE_IDENTITY];

MSDN.Microsoft.com上有很多示例

Answer 3

使用LINQ我能够解决问题。这是代码：

    var sqtmDC = new SqtmLinqDataContext();

        var mainTable = from generalInfo in sqtmDC.GetTable<General_Info>()
                      //join quoteData in sqtmDataContext.GetTable<Quote_Data>() on generalInfo.Quote_ID equals quoteData.Quote_ID
                      select generalInfo;

                      myGrid.ItemsSource = mainTable;
    }

     private void submitBtn_Click(object sender, RoutedEventArgs e)
    {
        var sqtmDC = new SqtmLinqDataContext();

       // string theDate = System.DateTime.Today.Date.ToString("d");
        int quantity = Convert.ToInt32(quantityTxt.Text);

        General_Info insert = new General_Info();

        insert.Open_Quote = DateTime.UtcNow;
        insert.Customer_Name = customerNameTxt.Text;
        insert.OEM_Name = oemNameTxt.Text;
        insert.Qty = quantity;
        insert.Quote_Num = quoteNumberTxt.Text;
        insert.Fab_Drawing_Num = fabDrawingNumTxt.Text;
        insert.Rfq_Num = rfqNumberTxt.Text;
        insert.Rev_Num = revNumberTxt.Text;

        sqtmDC.General_Infos.InsertOnSubmit(insert);
        sqtmDC.SubmitChanges();

        int quoteID = insert.Quote_ID;

        var mainTable = from generalInfo in sqtmDC.GetTable<General_Info>()

                        select generalInfo;

        myGrid.ItemsSource = mainTable;

无法在WPF中更新我的数据网格

3 个答案: