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2010-05-26T15:31:53Z

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2010-05-26T12:16:26Z

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==Assign returning value from "Typeof Operator" to "Type" variable ==

<source lang="csharp">using System;
using System.Reflection;
class MyClass
{
public int Field1;
public int Field2;
public void Method1() { }
public int Method2() { return 1; }
}
class MainClass
{
static void Main()
{
Type t = typeof(MyClass);
FieldInfo[] fi = t.GetFields();
foreach (FieldInfo f in fi)
Console.WriteLine("Field : {0}", f.Name);
}
}</source>
<pre class=codeResult>We have a SomeClass object here</pre>

==Demonstrate typeof==

<source lang="csharp">using System;
using System.IO;

class MainClass {
public static void Main() {
Type t = typeof(StreamReader);

Console.WriteLine(t.FullName);

if(t.IsClass)
Console.WriteLine("Is a class.");
if(t.IsAbstract)
Console.WriteLine("Is abstract.");
else
Console.WriteLine("Is concrete.");

}
}</source>
<pre class=codeResult>System.IO.StreamReader
Is a class.
Is concrete.</pre>

==Obtain type information using the typeof operator==

<source lang="csharp">using System;
using System.Text;
class MainClass
{
public static void Main()
{
Type t1 = typeof(StringBuilder);
}
}</source>

==typeof a Class name==

<source lang="csharp">using System;
using System.IO;
class MainClass
{
public static void Main()
{
Object someObject = new StringReader("This is a StringReader");
if (typeof(StringReader) == someObject.GetType())
{
Console.WriteLine("typeof: someObject is a StringReader");
}
}
}</source>
<pre class=codeResult>typeof: someObject is a StringReader</pre>

==Using typeof==

You can use the "typeof" operator to obtain information about a type.
The typeof operator returns a System.Type object for a given type.
The typeof operator has this general form:

<source lang="csharp">typeof(type)</source>
type is the type being obtained.
The System.Type object returned encapsulates the information associated with type.

==Using typeof operator in if statement==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Text;
class MainClass
{
static void Main(string[] args)
{
SomeClass someObject = new SomeClass();
if (someObject.GetType() == typeof(SomeClass))
{
Console.WriteLine("We have a SomeClass object here");
}
}
}
class SomeClass
{
}</source>
<pre class=codeResult>We have a SomeClass object here</pre>

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Csharp/CSharp Tutorial/Operator/typeof - История изменений

в 15:31, 26 мая 2010

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