.net core qr code reader

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In the absence of any out-of-the-box solution for generating RSS feeds in your website, you need to use classes such as XmlTextWriter yourself. You also need to remember the allowed tag names. To overcome this problem, we will create a custom class called RssWriter. The RssWriter class will inherit from XmlWriter and allow you to emit RSS feeds easily. To create RssWriter, you need to create a class library project. As before, be sure to add a reference to the System.Xml assembly.

[TearDown] public void Destroy() { } [Test] public void TestGetProductsByCategory() { ArrayList products = ProductData.GetProductsByCategory(categoryID); Assert.IsNotNull(products, "GetProductsByCategory returned a null value, gasp!"); Assert.IsTrue(products.Count > 0, "Bad Products count, gasp!"); } } } Build the solution and verify that it does not build correctly. Then add the minimal ProductData.cs class file shown in Listing 13-21 to the DataLayer project. Listing 13-21. Minimal ProductData.cs File #region Using directives using System; using System.Collections; using System.Collections.Generic; using System.Text; #endregion namespace DataLayer { public class ProductData { public ProductData() { } public static ArrayList GetProductsByCategory(int categoryID) { ArrayList products = null; return products; } } }

Note For those of you on a Windows platform, the installation of the Subversion software is quite easy.

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The GetElementsByTagName() method of the XmlDocument class accepts the name of the tag (excluding < and >) and returns all the nodes matching that tag name. The matching nodes are returned as an XmlNodeList. The XmlNodeList class represents a collection of XmlNode objects. To see GetElementsByTagName() in action, we need to develop a Windows application as shown in Figure 2-4.

Just click the Next button about seven or eight times. The Subversion installer takes care of the rest.

Figure 2-4. Using the GetElementsByTagName() method The application consists of a text box to enter the tag name to look for. After you click the Search button, the matching tags are displayed in the list box. Selecting a tag from the list box displays its contents in a read-only text box. The code that makes the preceding form work is given in Listing 2-5. Listing 2-5. Using the GetElementsByTagName() Method XmlNodeList list = null; private void button1_Click(object sender, EventArgs e) { XmlDocument doc = new XmlDocument(); doc.Load(Application.StartupPath + "/employees.xml"); list = doc.GetElementsByTagName(textBox1.Text); listBox1.Items.Clear(); foreach (XmlNode node in list) { listBox1.Items.Add(node.Name); } }

As with the Login user story, you should be able to build and run the solution for this story (assuming you have set the TestLayer project as the startup project). The ProductTests GetProductsByCategory test case will fail because you are returning a null ArrayList at this time. Fix this by first enhancing the ProductData.cs class as shown in Listing 13-22. Listing 13-22. Modified ProductData.cs Class #region Using directives using System; using System.Collections; using System.Collections.Generic; using System.Data; using System.Data.Odbc; using System.Text; using BusinessLayer; #endregion namespace DataLayer { public class ProductData { private static string connectionString = "Driver={Microsoft Access Driver (*.mdb)};" + "DBQ=c:\\xpnet\\database\\Northwind.mdb"; public ProductData() { } public static ArrayList GetProductsByCategory(int categoryID) { ArrayList products = new ArrayList(); try { OdbcConnection dataConnection = new OdbcConnection(); dataConnection.ConnectionString = connectionString; dataConnection.Open(); OdbcCommand dataCommand = new OdbcCommand(); dataCommand.Connection = dataConnection; // Build command string StringBuilder commandText = new StringBuilder("SELECT * FROM Products WHERE CategoryID="); commandText.Append(categoryID); commandText.Append(" AND UnitsInStock > 0");

Once you have installed the Subversion client and the NetBeans Subversion module, you are ready to begin working with Subversion repositories.

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