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gewarrengewarren
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fix ops and snippets errors
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‎media/gdip-art10.gif‎

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‎media/gdip-art12.gif‎

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‎snippets/csharp/System.Data/DataTable/Overview/project.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Library</OutputType>
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<TargetFramework>net4.8</TargetFramework>
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<UseWindowsForms>true</UseWindowsForms>
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</PropertyGroup>
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</Project>

‎snippets/csharp/System.Data/DataTable/Overview/source.cs‎

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// <Snippet1>
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using System;
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using System.Data;
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class Program
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{
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static void Main(string[] args)
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{
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// Create two tables and add them into the DataSet
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DataTable orderTable = CreateOrderTable();
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DataTable orderDetailTable = CreateOrderDetailTable();
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DataSet salesSet = new DataSet();
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salesSet.Tables.Add(orderTable);
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salesSet.Tables.Add(orderDetailTable);
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// Set the relations between the tables and create the related constraint.
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salesSet.Relations.Add("OrderOrderDetail", orderTable.Columns["OrderId"], orderDetailTable.Columns["OrderId"], true);
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Console.WriteLine("After creating the foreign key constriant, you will see the following error if inserting order detail with the wrong OrderId: ");
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try
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{
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DataRow errorRow = orderDetailTable.NewRow();
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errorRow[0] = 1;
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errorRow[1] = "O0007";
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orderDetailTable.Rows.Add(errorRow);
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}
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catch (Exception e)
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{
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Console.WriteLine(e.Message);
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}
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Console.WriteLine();
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// Insert the rows into the table
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InsertOrders(orderTable);
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InsertOrderDetails(orderDetailTable);
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Console.WriteLine("The initial Order table.");
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ShowTable(orderTable);
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Console.WriteLine("The OrderDetail table.");
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ShowTable(orderDetailTable);
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// Use the Aggregate-Sum on the child table column to get the result.
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DataColumn colSub = new DataColumn("SubTotal", typeof(Decimal), "Sum(Child.LineTotal)");
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orderTable.Columns.Add(colSub);
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// Compute the tax by referencing the SubTotal expression column.
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DataColumn colTax = new DataColumn("Tax", typeof(Decimal), "SubTotal*0.1");
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orderTable.Columns.Add(colTax);
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// If the OrderId is 'Total', compute the due on all orders; or compute the due on this order.
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DataColumn colTotal = new DataColumn("TotalDue", typeof(Decimal), "IIF(OrderId='Total',Sum(SubTotal)+Sum(Tax),SubTotal+Tax)");
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orderTable.Columns.Add(colTotal);
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DataRow row = orderTable.NewRow();
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row["OrderId"] = "Total";
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orderTable.Rows.Add(row);
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Console.WriteLine("The Order table with the expression columns.");
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ShowTable(orderTable);
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Console.WriteLine("Press any key to exit.....");
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Console.ReadKey();
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}
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private static DataTable CreateOrderTable()
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{
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DataTable orderTable = new DataTable("Order");
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// Define one column.
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DataColumn colId = new DataColumn("OrderId", typeof(String));
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orderTable.Columns.Add(colId);
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DataColumn colDate = new DataColumn("OrderDate", typeof(DateTime));
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orderTable.Columns.Add(colDate);
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// Set the OrderId column as the primary key.
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orderTable.PrimaryKey = new DataColumn[] { colId };
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return orderTable;
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}
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private static DataTable CreateOrderDetailTable()
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{
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DataTable orderDetailTable = new DataTable("OrderDetail");
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// Define all the columns once.
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DataColumn[] cols =
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{
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new DataColumn("OrderDetailId", typeof(Int32)),
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new DataColumn("OrderId", typeof(String)),
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new DataColumn("Product", typeof(String)),
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new DataColumn("UnitPrice", typeof(Decimal)),
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new DataColumn("OrderQty", typeof(Int32)),
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new DataColumn("LineTotal", typeof(Decimal), "UnitPrice*OrderQty")
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};
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orderDetailTable.Columns.AddRange(cols);
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orderDetailTable.PrimaryKey = new DataColumn[] { orderDetailTable.Columns["OrderDetailId"] };
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return orderDetailTable;
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}
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private static void InsertOrders(DataTable orderTable)
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{
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// Add one row once.
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DataRow row1 = orderTable.NewRow();
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row1["OrderId"] = "O0001";
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row1["OrderDate"] = new DateTime(2013, 3, 1);
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orderTable.Rows.Add(row1);
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DataRow row2 = orderTable.NewRow();
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row2["OrderId"] = "O0002";
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row2["OrderDate"] = new DateTime(2013, 3, 12);
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orderTable.Rows.Add(row2);
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DataRow row3 = orderTable.NewRow();
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row3["OrderId"] = "O0003";
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row3["OrderDate"] = new DateTime(2013, 3, 20);
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orderTable.Rows.Add(row3);
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}
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private static void InsertOrderDetails(DataTable orderDetailTable)
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{
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// Use an Object array to insert all the rows .
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// Values in the array are matched sequentially to the columns, based on the order in which they appear in the table.
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Object[] rows =
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{
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new Object[] { 1, "O0001", "Mountain Bike", 1419.5, 36 },
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new Object[] { 2, "O0001", "Road Bike", 1233.6, 16 },
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new Object[] { 3, "O0001", "Touring Bike", 1653.3, 32 },
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new Object[] { 4, "O0002", "Mountain Bike", 1419.5, 24 },
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new Object[] { 5, "O0002", "Road Bike", 1233.6, 12 },
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new Object[] { 6, "O0003", "Mountain Bike", 1419.5, 48 },
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new Object[] { 7, "O0003", "Touring Bike", 1653.3, 8 },
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};
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foreach (Object[] row in rows)
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{
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orderDetailTable.Rows.Add(row);
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}
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}
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private static void ShowTable(DataTable table)
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{
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foreach (DataColumn col in table.Columns)
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{
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Console.Write("{0,-14}", col.ColumnName);
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}
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Console.WriteLine();
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foreach (DataRow row in table.Rows)
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{
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foreach (DataColumn col in table.Columns)
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{
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if (col.DataType.Equals(typeof(DateTime)))
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Console.Write("{0,-14:d}", row[col]);
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else if (col.DataType.Equals(typeof(Decimal)))
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Console.Write("{0,-14:C}", row[col]);
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else
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Console.Write("{0,-14}", row[col]);
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}
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Console.WriteLine();
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}
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Console.WriteLine();
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}
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}
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// </Snippet1>

‎snippets/csharp/System.Diagnostics.Tracing/EventSource/Overview/etwtracesmall.csproj‎

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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net6.0</TargetFramework>
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<TargetFramework>net10.0</TargetFramework>
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<Nullable>enable</Nullable>
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<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
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<StartupObject>Demo.Program</StartupObject>

‎snippets/csharp/System.Diagnostics.Tracing/EventSource/Overview/program.cs‎

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using System.Collections.Generic;
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using System.Diagnostics.Tracing;
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namespace Demo
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namespace Demo1
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{
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//<InterfaceSource>
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public interface IMyLogging

‎xml/System.Drawing.Drawing2D/Matrix.xml‎

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In GDI+, you can store an affine transformation in a <xref:System.Drawing.Drawing2D.Matrix> object. Because the third column of a matrix that represents an affine transformation is always (0, 0, 1), you specify only the six numbers in the first two columns when you construct a <xref:System.Drawing.Drawing2D.Matrix> object. The statement `Matrix myMatrix = new Matrix(0, 1, -1, 0, 3, 4)` constructs the matrix shown in the following figure.
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![Matrix.](./media/gdip-art10.gif)
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![Matrix.](~/media/gdip-art10.gif)
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[!INCLUDE[System.Drawing.Common note](./includes/system-drawing-common.md)]
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[!INCLUDE[System.Drawing.Common note](~/includes/system-drawing-common.md)]
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## Composite transformations
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The following illustration shows the matrices A, B, C, and D.
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![Matrices A, B, C, and D](./media/gdip-art12.gif)
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![Matrices A, B, C, and D](~/media/gdip-art12.gif)
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The fact that the matrix of a composite transformation can be formed by multiplying the individual transformation matrices means that any sequence of affine transformations can be stored in a single <xref:System.Drawing.Drawing2D.Matrix> object.
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