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Starting Processes
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The .NET Framework provides the Process class, which starts processes. The following example shows how to start Notepad: // file=process.cs // compile with csc process.cs using System.Diagnostics; class Test { public static void Main() { ProcessStartInfo startInfo = new ProcessStartInfo(); startInfo.FileName = "notepad.exe"; startInfo.Arguments = "process.cs"; Process.Start(startInfo); } } The arguments used in starting the process are contained in the ProcessStartInfo object.
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Redirecting Process Output
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Sometimes it s useful to get the output from a process. You can do this in the following way: using System; using System.Diagnostics; class Test { public static void Main() { Process p = new Process(); p.StartInfo.FileName = "cmd.exe"; p.StartInfo.Arguments = "/c dir *.cs"; p.StartInfo.UseShellExecute = false; p.StartInfo.RedirectStandardOutput = true; p.Start(); string output = p.StandardOutput.ReadToEnd(); Console.WriteLine("Output:"); Console.WriteLine(output); } }
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CHAPTER 34 .NET FRAMEWORK OVERVIEW
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Detecting Process Completion
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It s also possible to detect when a process exits: // file=process3.cs // compile with csc process3.cs using System; using System.Diagnostics; class Test { static void ProcessDone(object sender, EventArgs e) { Console.WriteLine("Process Exited"); } public static void Main() { Process p = new Process(); p.StartInfo.FileName = "notepad.exe"; p.StartInfo.Arguments = "process3.cs"; p.EnableRaisingEvents = true; p.Exited += new EventHandler(ProcessDone); p.Start(); p.WaitForExit(); Console.WriteLine("Back from WaitForExit()"); } } This example shows two ways of detecting process completion. The ProcessDone() function is called when the Exited event is fired, and the WaitForExit() function also returns when the process is done.
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Serialization
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Serialization is the process used by the runtime to persist objects in some sort of storage or to transfer them from one location to another. The metadata information on an object contains sufficient information for the runtime to serialize the fields, but the runtime needs a little help to do the right thing. Two attributes provide this help. The [Serializable] attribute marks an object as okay to serialize. You can apply the [NonSerialized] attribute to a field or property to indicate that it shouldn t be serialized. This is useful if it s a cache or derived value. The following example has a container class named MyRow that has elements of the MyElement class. The cacheValue field in MyElement is marked with the [NonSerialized] attribute to prevent it from being serialized. In this example, the MyRow object is serialized and deserialized to a binary format and then to an XML format:
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CHAPTER 34 .NET FRAMEWORK OVERVIEW
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// file=serial.cs // compile with: csc serial.cs using System; using System.IO; using System.Collections; using System.Runtime.Serialization; using System.Runtime.Serialization.Formatters.Binary; using System.Runtime.Serialization.Formatters.Soap; [Serializable] public class MyElement { public MyElement(string name) { this.name = name; this.cacheValue = 15; } public override string ToString() { return(String.Format("{0}: {1}", name, cacheValue)); } string name; // this field isn't persisted. [NonSerialized] int cacheValue; } [Serializable] public class MyRow { public void Add(MyElement my) { row.Add(my); } public override string ToString() { string temp = null; foreach (MyElement my in row) temp += my.ToString() + "\n"; return(temp); }
CHAPTER 34 .NET FRAMEWORK OVERVIEW
ArrayList row = new ArrayList(); } class Test { public static void Main() { MyRow row = new MyRow(); row.Add(new MyElement("Gumby")); row.Add(new MyElement("Pokey")); Console.WriteLine("Initial value"); Console.WriteLine("{0}", row); // write to binary, read it back Stream streamWrite = File.Create("MyRow.bin"); BinaryFormatter binaryWrite = new BinaryFormatter(); binaryWrite.Serialize(streamWrite, row); streamWrite.Close(); Stream streamRead = File.OpenRead("MyRow.bin"); BinaryFormatter binaryRead = new BinaryFormatter(); MyRow rowBinary = (MyRow) binaryRead.Deserialize(streamRead); streamRead.Close(); Console.WriteLine("Values after binary serialization"); Console.WriteLine("{0}", rowBinary); // write to SOAP (XML), read it back streamWrite = File.Create("MyRow.xml"); SoapFormatter soapWrite = new SoapFormatter(); soapWrite.Serialize(streamWrite, row); streamWrite.Close(); streamRead = File.OpenRead("MyRow.xml"); SoapFormatter soapRead = new SoapFormatter(); MyRow rowSoap = (MyRow) soapRead.Deserialize(streamRead); streamRead.Close(); Console.WriteLine("Values after SOAP serialization"); Console.WriteLine("{0}", rowSoap); } }
CHAPTER 34 .NET FRAMEWORK OVERVIEW
The example produces the following output: Initial value Gumby: 15 Pokey: 15 Values after binary serialization Gumby: 0 Pokey: 0 Values after SOAP serialization Gumby: 0 Pokey: 0 The field cacheValue isn t preserved, since it was marked as [NonSerialized]. The file MyRow.Bin will contain the binary serialization, and the file MyRow.xml will contain the XML version. The XML encoding is in SOAP, which is a textual dump of the objects, in an (almost) human-readable form. To produce a specific XML encoding, use the XmlSerializer class.
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