调试



实际上调试和跟踪用得很普遍。Debug类中的方法有相同的名字的方法，这些方法实现了调试的功能。不同之处是在发布版本配置中是禁止使用的（这意味着不能产生二进制代码调用这些代码）。调试输出也可以在配置文件设置，请看下面：

<confuration>

<system.diagnostics>

<debug autoflush = “true” indentsize = “7” / >

</system.diagnostics>

</confuration>

备注：调试的声明和语法和跟踪很类似。不同之处，就是把有Trace的地方替换为Debug



设置调试开关

最后讨论的主题是Switch。Switch是有一些状态的对象。可以在配置文件或者编程的时候改变状态。Switch让你创建可配置的调试跟踪代码。最好了解Switch的方法是写一个段简单代码，如下：

using System;

using System.Diagnostics;



namespace Switching

{

class SampleClass

{

//Create a Switch. It is initialized by an externally specified value

static TraceSwitch generalSwitch = new TraceSwitch(“CoolSwitch”, “Global Scope”);

static public void SampleMethod()

{

//The first message is written if the switch state is set to TraceError

if(generalSwitch.TraceError)

console.WriteLine(“TraceError message”);

//The second message is written if the switch state is set to TraceVerbose

if (generalSwitch.TraceVerbose)

Console.WriteLine(“TraceVerbose message”);

//The third message is writeen if the switch state is set to TraceWarning

if (generalSwitch.TraceWarning)

Console.WriteLine(“TreaceWarning message”);

//The fourth message is written if the switch state is set to TraceInfo

if(generalSwitch.TraceInfo)

Console.WriteLine(“TraceInfo Message”);

}

public static void Main(string[] args)

{

//calls the sampleMethod method

SampleMethod();

}

}

}



有几个switch类：TraceSwitch和BooleanSwitch。这个例子中我们用使用TraceSwitch依照他们的状态创建输出信息。Switch状态由TraceErrror,TraceInfo,TraceVerbose和TraceWarning属性检查。这些属性检查switch状态和如果trace级别等于或大于相应的常量，那么将返回true。例如，当这个级别是2或者更大那么TraceWarning是true，下面表格是返回值：

TraceErroe
1

TraceWarning
2

TraceInfo
3

TraceVerbose
4


但是，正如我们已经说的，switch的状态可以在代码中修改，做个修改代码的范例：

using System;

using System.Diagnostics;



namespace Switching

{

class SampleClass

{

//Create a Switch. It is initialized by an externally specified value

static TraceSwitch generalSwitch = new TraceSwitch(“CoolSwitch”, “Global Scope”);

static public void SampleMethod()

{

//The first message is written if the switch state is set to TraceError

if(generalSwitch.TraceError)

console.WriteLine(“TraceError message”);

//The second message is written if the switch state is set to TraceVerbose

if (generalSwitch.TraceVerbose)

Console.WriteLine(“TraceVerbose message”);

//The third message is writeen if the switch state is set to TraceWarning

if (generalSwitch.TraceWarning)

Console.WriteLine(“TreaceWarning message”);

//The fourth message is written if the switch state is set to TraceInfo

if(generalSwitch.TraceInfo)

Console.WriteLine(“TraceInfo Message”);

}

public static void Main(string[] args)

{

Console.WriteLine(“Before manual level set\n”);

SampleMethod();

GeneralSwitch.Level = TraceLevel.Warning;