c# .net core barcode generator

c# .net core barcode generator

c# .net core barcode generator

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User-defined functions, as mentioned previously, come in two varieties: scalar and table-valued. The former must return exactly one value, whereas the latter can return a table of values, with many columns and rows. A table-valued user-defined function can be thought of as a parameterized view: the query logic is encapsulated within the body of the function, and parameters can be passed in to control the output. In addition, a table-valued function can be used anywhere in T-SQL queries that a view can. CLR user-defined functions are somewhat different from their T-SQL counterparts, in that they have the capability to stream their data to the client (the calling SQL Server process) instead of writing it to a temporary table as multistatement T-SQL user-defined functions do. This can mean, in some cases, that CLR user-defined functions will be able to outperform their T-SQL counterparts. Remember, however, that as with any performance-boosting methodology, you should test both methods in most cases to ensure that you make the best choice.

Figure B-14. Breaking the control into quadrants helps with the design layout and selecting the correct layout controls. The control in Figure B-14 looks pretty good for an initial guess. However, as you can see, the tick mark labels on the bottom of the quantitative scale would be cut off if you only had four quadrants. One option would be to create a margin between the right border. Other options are to create a whitespace quadrant that will not host any controls but act as a buffer or to use right alignment for all tick marks. This will make the dynamic math calculations much easier. After adding the whitespace buffer, you will have six quadrants that look like Figure B-15.

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//handle property changed sp.PropertyChanged += new System.ComponentModel. PropertyChangedEventHandler(Spending_PropertyChanged); //force a recalc of the bars in the graph sp.ParentCollection = SpendingList; } } //item removed else if (Msg.MsgType == MessageType.ItemRemoved) { foreach (Spending sp in Msg.Items) { //unhook the event handler SpendingList[SpendingList.IndexOf(sp)].PropertyChanged -= Spending_PropertyChanged; //remove from data source SpendingList.Remove(sp); } //force a recalc of the bars in the graph if (SpendingList.Count > 0) SpendingList[0].ParentCollection = SpendingList; } }); //start listening for incoming messages GraphReceiver.Listen(); } void Spending_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e) { //send a message GraphSender.SendAsync( Message.Serialize( new Message { //changed item Items = new List<Spending> { sender as Spending }, //message type - item value changed MsgType = MessageType.ItemsValueChanged })); }

Creating a table-valued user-defined function involves defining a function that returns an instance of a collection that implements the IEnumerable interface. This collection will be enumerated by the query engine, and that enumeration will result in calling a second function for each member of the collection, in order to map its attributes to a series of output parameters that map to the column list for the table. This process is better described using a concrete example. Assume that you wish to encapsulate the following query in a user-defined function: SELECT Name, GroupName FROM HumanResources.Department This query can be evaluated and used to populate a DataTable. Since the DataTable class implements IEnumerable, it is a valid return type for a table-valued function. The following code defines a method called GetDepartments that retrieves and returns the data using a context connection: [Microsoft.SqlServer.Server.SqlFunction( DataAccess=DataAccessKind.Read, FillRowMethodName="GetNextDepartment", TableDefinition="Name nvarchar(50), GroupName nvarchar(50)")] public static IEnumerable GetDepartments() { using (SqlConnection conn = new SqlConnection("context connection=true;")) { string sql = "SELECT Name, GroupName FROM HumanResources.Department"; conn.Open();

Figure B-15. The bullet graph layout now has four quadrants that host the children components and two whitespace buffers. Separating the bullet graph layout implementation into four quadrants, we can see which controls belong into which section: Quadrant 1: The first quadrant hosts three qualitative range progress bars, the featured measure progress bar, and the comparative measure rectangle. Quadrant 2: The second quadrant hosts the bullet graph label, which will be surfaced using a TextBlock control. Quadrant 3: The third quadrant hosts the units label, which will be surfaced using a TextBlock control Quadrant 4: The fourth quadrant hosts the quantitative scale. An important note is that both Quadrant 1 and Quadrant 4 have to be aligned so that the quantitative scale tick marks match the location of the progress bars in Quadrant 1.

SqlCommand comm = new SqlCommand(sql, conn); SqlDataAdapter adapter = new SqlDataAdapter(comm); DataSet dSet = new DataSet(); adapterFill(dSet); return (dSetTables[0]Rows); } } Aside from the fact that this method contains no exception-handling logic and will behave very poorly if the Department table is empty an important thing to note in this code listing is the SqlFunction attribute Since the function is reading data from the database using the context connection, the DataAccess parameter is set to DataAccessKindRead But more important, because this is a table-valued function, both the FillRowMethodName and TableDefinition parameters are used The FillRowMethodName parameter defines the name of the method that will be used to map each member of the IEnumerable collection returned by the method to a column The column list that the method must support is defined by the TableDefinition parameter In this case, the method is called GetNextDepartment.

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