Question

我遇到了一个小问题。我想在单击ListView控件行时从我的Sql表中获取要在Image控件中显示的图像数据。我正在使用C＃WPF和Microsoft SQL。

现在我已经可以将图像插入到我的数据库中，但我遇到的问题是，一旦点击ListView中的某行，我似乎无法检索图像数据？这是我尝试过的编码......

这是我用来填充ListView的编码：

    private void FillEmployeeListView()
    {
        string ConString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        string CmdString = string.Empty;
        using (SqlConnection CON = new SqlConnection(ConString))
        {
            CmdString = "SELECT EmployeeEmailAddress, EmployeePassword, EmployeeDepartment, EmployeeIDNumber, EmployeeName, EmployeeSurname, EmployeeGender, EmployeeDOB, EmployeeHomeAddress, EmployeeTelephoneNumber, EmplyeeCity, EmployeeProvinceCode, EmployeeProfilePicture FROM Main.tblEmployeeLoginDetails";
            SqlCommand CMD = new SqlCommand(CmdString, CON);
            SqlDataAdapter SDA = new SqlDataAdapter(CMD);
            DataTable DT = new DataTable("Main.tblEmployeeLoginIDetails");
            SDA.Fill(DT);

            lvDisplayEmployeeInformation.ItemsSource = DT.DefaultView;
        }
    }

我的ListView的SelectionChanged事件：

    private void lvDisplayEmployeeInformation_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {           
        int selectedRow = lvDisplayEmployeeInformation.SelectedIndex;

        if (selectedRow != -1)
        {
            DataView DS = (DataView)lvDisplayEmployeeInformation.ItemsSource;
            string ColumnEmailAddress = DS.Table.Rows[selectedRow].ItemArray[0].ToString();
            string ColumnPassword = DS.Table.Rows[selectedRow].ItemArray[1].ToString();
            string ColumnDepartment = DS.Table.Rows[selectedRow].ItemArray[2].ToString();
            string ColumnIDNumber = DS.Table.Rows[selectedRow].ItemArray[3].ToString();
            string ColumnName = DS.Table.Rows[selectedRow].ItemArray[4].ToString();
            string ColumnSurname = DS.Table.Rows[selectedRow].ItemArray[5].ToString();
            string ColumnGender = DS.Table.Rows[selectedRow].ItemArray[6].ToString();
            string ColumnDOB = DS.Table.Rows[selectedRow].ItemArray[7].ToString();
            string ColumnHomeAddress = DS.Table.Rows[selectedRow].ItemArray[8].ToString();
            string ColumnTelephoneNumber = DS.Table.Rows[selectedRow].ItemArray[9].ToString();
            string ColumnCity = DS.Table.Rows[selectedRow].ItemArray[10].ToString();
            string ColumnProvinceCode = DS.Table.Rows[selectedRow].ItemArray[11].ToString();
            string ColumnProfilePicture = DS.Table.Rows[selectedRow].ItemArray[12].ToString();

            txtEmailAddress.Text = ColumnEmailAddress;
            pbPassword.Password = ColumnPassword;
            txtDepartment.Text = ColumnDepartment;
            txtIDNumber.Text = ColumnIDNumber;
            txtName.Text = ColumnName;
            txtSurname.Text = ColumnSurname;
            txtGender.Text = ColumnGender;
            txtDOB.Text = ColumnDOB;
            txtHomeAddress.Text = ColumnHomeAddress;
            txtTelephoneNumber.Text = ColumnTelephoneNumber;
            txtCity.Text = ColumnCity;
            txtProvinceCode.Text = ColumnProvinceCode;
            imgProfilePicture.Source = _img;

最后，这是我想用来转换/插入和从我的数据库中检索我的图像的编码：

    private void SetImage(Binary data)
    {
        if (data == null)
        {
            imgProfilePicture.BeginInit();
            imgProfilePicture.Source = null;
            imgProfilePicture.EndInit();
            return;
        }

        _img = new BitmapImage();
        _img.BeginInit();
        _img.StreamSource = new MemoryStream(data.ToArray());
        _img.EndInit();

        imgProfilePicture.BeginInit();
        imgProfilePicture.Source = _img;
        imgProfilePicture.EndInit();
    }
    private Binary GetImageBinary()
    {
        if (imgProfilePicture.Source == null)
            return null;

        Stream stream = _img.StreamSource;
        Byte[] buffer = null;
        if (stream != null && stream.CanRead && stream.Length > 0)
        {
            //Die Binary reader return 'n empty byte array :(
            using (BinaryReader br = new BinaryReader(stream))
            {
                buffer = br.ReadBytes((int)stream.Length);
            }
        }
        return new Binary(buffer);
    }

一旦我点击listview中的一行，我就可以将数据库中的文本插入到我的文本框中了。任何想法？

编辑：我得到的错误如下 - “找不到适合完成此操作的成像组件。”

单击ListView行时在Imagebox中显示图像

0 个答案: