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The following code shows an example of a query expression that contains two where clauses. The where clauses eliminate each set of integers from the two arrays where the sum of the two is not greater than or equal to 11, and the element from groupA is not the value 4. Each set of elements selected must satisfy the conditions of both where clauses. static void Main() { var groupA = new[] { 3, 4, 5, 6 }; var groupB = new[] { 6, 7, 8, 9 }; var someInts = from int a in groupA from int b in groupB let sum = a + b where sum >= 11 where a == 4 select new {a, b, sum}; foreach (var a in someInts) Console.WriteLine(a); } This code produces the following output: { a = 4, b = 7, sum = 11 } { a = 4, b = 8, sum = 12 } { a = 4, b = 9, sum = 13 }
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Figure 5-2. An example of unoptimized metadata Two scenarios usually result in the emission of an uncompressed metadata structure: an edit-and-continue scenario, in which metadata and the IL code of a module are modified while the module is loaded in memory, and an incremental compilation scenario, in which metadata and IL code are modified in installments.
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Figure 7-7. Adding, updating, and deleting child objects in a collection
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0s and 1s are fine for internal computation, but for human-readable input and output, we need strings of characters. The BCL provides a number of classes that make string handling easy. The C# predefined type string represents the .NET class System.String. The most important things to know about strings are the following: Strings are arrays of Unicode characters. Strings are immutable they cannot be changed. The string type has many useful string-manipulation members, including those that allow you to determine their length, change their case, concatenate strings, and perform many other useful tasks. Some of the most useful members are listed in Table 25-1. Table 25-1. Useful Members of the string Type
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When you make changes to your database then you will also need to update your EDM. To update the model simply right-click on the design surface and select Update Model from Database. Visual Studio will then bring up a dialog box allowing you to add additional tables and fields (Figure 8-8). Note that this release of EF improves the resolution of conflicts/orphaned model elements in the model browser window:
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When the page loads, an ApplyAuthorizationRules() method is called: Protected Sub Page_Load( _ ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If Not IsPostBack Then ApplyAuthorizationRules() Else Me.ErrorLabel.Text = "" End If End Sub Private Sub ApplyAuthorizationRules() ' project display If Project.CanEditObject Then Dim obj As Project = GetProject() If obj.IsNew Then Me.DetailsView1.DefaultMode = DetailsViewMode.Insert Else Me.DetailsView1.DefaultMode = DetailsViewMode.Edit End If Me.AddResourceButton.Visible = Not obj.IsNew Else Me.DetailsView1.DefaultMode = DetailsViewMode.ReadOnly Me.AddResourceButton.Visible = False End If Me.DetailsView1.Rows(Me.DetailsView1.Rows.Count - 1).Visible = _ Project.CanEditObject ' resources display Me.GridView1.Columns(Me.GridView1.Columns.Count - 1).Visible = _ Project.CanEditObject End Sub As with the previous forms, various controls, GridView columns, and DetailsView rows are made visible or invisible depending on the authorization values returned from the business objects. Additionally, the mode of the DetailsView control is set based on the business object s IsNew property: If obj.IsNew Then Me.DetailsView1.DefaultMode = DetailsViewMode.Insert Else Me.DetailsView1.DefaultMode = DetailsViewMode.Edit End If This ensures that the user gets the right set of options in the CommandField row of the DetailsView control based on whether they are adding or editing the object. Finally, it is possible for the object s authorization rules to change depending on whether it is new or old. Though not strictly an authorization rule, setting the DetailsView control s DetailsViewMode property, as shown previously, is an example. This means that when the object changes from new to old, then authorization rules should be rechecked.
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1. With this new Style selected, draw a TextBlock out on the Homepage Screen, as I have done
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The References list ensures that the assemblies will be found by the project build system. It has the same effect as specifying #using in the source code; in fact, what it does is add the /FU option discussed earlier in this chapter to the build command line. Selecting Add Reference in the dialog in Figure 3-4 brings up the Add Reference dialog, shown in Figure 3-5, which allows you to choose from a variety of assemblies provided by the system. This list is defined in the registry, so your own assemblies do not appear in the list.
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Release the reservation like so: Port.ReservePin(Cpu.Pin.GPIO_Pin1, false); The value of the second parameter indicates whether the pin is to be reserved or released.
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In this chapter, we looked at how C# supports working with files and directories, using either the File and Directory or FileInfo and DirectoryInfo classes. We saw how to compose and manipulate file paths using the Path class and how to monitor a directory for changes and how to specify which changes we are interested in. We also explored the support for streams, which are a general-purpose feature for reading and writing sequential byte data to a range of backing stores in a consistent way. Because working with byte values can be very tedious, we also looked at the reader and writer classes that make working with binary and textual representations of built-in type values a breeze.
Caution
set { txtTimestamp.Text = BitConverter.ToString((byte[])value); } } This code uses a BitConverter to transform the byte array received from the database into a string, and then uses the Convert.ToByte method to transform it back into a byte array for populating a parameter value to send to the database. By typing it as an Object, consumers of the control need not worry about their parameter values. They can set it with code like this (user control instance is named tsAuthor): tsAuthor.TimestampValue = cm.Parameters["@ts"].Value; And they can retrieve the value with this line of code: pm = cm.Parameters.Add("@ts", SqlDbType.Timestamp); pm.Value = tsAuthor.TimestampValue; This is the type of programming ease you re designing for by encapsulating this logic in the user control. So when the page first renders, you populate the author list. You ve done this several times, so this code is omitted here for brevity. You can see from the markup that when the user chooses an entry from the list, a postback occurs (AutoPostBack=true), and the BindToAuthor method is executed (from Concurrency3.aspx). protected void BindToAuthor(object sender, EventArgs e) { SqlConnection cn = new SqlConnection( ConfigurationManager.ConnectionStrings ["localPubs"].ConnectionString); SqlCommand cm = new SqlCommand( "select @fname = au_fname, @lname = au_lname, @ts = ts " + "from authors_ts where au_id = @id", cn); cm.Parameters.Add("@id", SqlDbType.Char, 11) .Value = ddlAuthors.SelectedValue; cm.Parameters.Add("@fname", SqlDbType.VarChar,20) .Direction = ParameterDirection.Output; cm.Parameters.Add("@lname", SqlDbType.VarChar,40) .Direction = ParameterDirection.Output; cm.Parameters.Add("@ts", SqlDbType.Timestamp) .Direction = ParameterDirection.Output; cn.Open(); cm.ExecuteNonQuery(); cn.Close();
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Listing 9-1 shows how an interface is declared and used in C++/CLI. The contextual keyword interface is used with class. All members of an interface are automatically public, so no access specifier is necessary in the interface declaration. Any other access control specifier is an error. The interface is used rather like a base class, except that more than one interface may be specified in the interface list. Methods that implement interface methods must be virtual. Listing 9-1. Declaring and Implementing an Interface // interface.cpp interface class IInterface { void f(); int g(); }; ref class R : IInterface { public: // The virtual keyword is required to implement the interface method. virtual void f() { } virtual int g() { return 1; } }; If multiple interfaces are to be implemented, they are separated by commas on the base list, as shown in Listing 9-2. Listing 9-2. Implementing Multiple Interfaces // interfaces_multiple.cpp interface class IA { void f(); };
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