web程序中获取应用程序系统变量的方法（ For.net 1.1)

获取系统变量在.net 的web应用程序中的确是非常方便，比如获取 "http://ap2:8080/"或者"http://10.0.0.1/mypplication/"等诸如此类的系统变量。

注：本文主要是针对.net Framework 1.0、1.1的情况，因为.net 2.0的命名空间已经发生了很大的变化，在后面的文章中将会专门加以介绍
。

为描述方便，先新建一aspx文件，前台文件如下：



<
body
MS_POSITIONING
="GridLayout"
>




<
form
id
="Form2"
method
="post"
runat
="server"
>




<
FONT
face
="宋体"
>




<
asp:Button
id
="btn_Page"
style
="Z-INDEX: 101; LEFT: 8px; POSITION: absolute; TOP: 16px"
runat
="server"



Text
="通过Page获取"
></
asp:Button
>




<
asp:Label
id
="lbInfo1"
style
="Z-INDEX: 102; LEFT: 48px; POSITION: absolute; TOP: 56px"
runat
="server"
></
asp:Label
>




<
asp:Button
id
="btn_ServerVal"
style
="Z-INDEX: 103; LEFT: 520px; POSITION: absolute; TOP: 16px"



runat
="server"
Text
="通过ServerVariables获取"
></
asp:Button
>




<
asp:Label
id
="lbInfo2"
style
="Z-INDEX: 104; LEFT: 48px; POSITION: absolute; TOP: 80px"
runat
="server"
></
asp:Label
>




<
asp:Label
id
="lbInfo3"
style
="Z-INDEX: 105; LEFT: 48px; POSITION: absolute; TOP: 104px"
runat
="server"
></
asp:Label
>




<
asp:Button
id
="btn_Cintext"
style
="Z-INDEX: 106; LEFT: 280px; POSITION: absolute; TOP: 16px"



runat
="server"
Text
="通过Context获取"
></
asp:Button
></
FONT
>




</
form
>




</
body
>



第一种方法，直接在在页面中获取。利用Page.Request命名空间。



private

void
btn_Page_Click(
object
sender, System.EventArgs e)






...
{




this
.lbInfo2.Text
=
""
;




this
.lbInfo3.Text
=
""
;




this
.lbInfo1.Text
=
Page.Request.ApplicationPath
+
"
<br/>
"




+
Page.Request.CurrentExecutionFilePath
+
"
<br/>
"




+
Page.Request.UserHostAddress
+
"
<br/>
"




+
Page.Request.Url.Host
+
"
<br/>
"




+
Page.Request.RawUrl
+
"
<br/>
"




+
Page.Request.UserHostName
+
"
<br/>
"




+
Page.Request.Url.HostNameType
+
"
<br/>
"




+
Page.Request.Url.Port
+
"
<br/>
"




+
Page.Request.UrlReferrer.Host
+
"
<br/>
"




+
Page.Request.Url.LocalPath
+
"
<br/>
"




+
Page.Request.Url.Authority
+
"
<br/>
"




+
Page.Request.Url.UserInfo
+
"
<br/>
"




+
"
<br/>
"
;







}



第二种方法：在非Web项目中用Context的Request方法。



private

void
btn_Cintext_Click(
object
sender, System.EventArgs e)






...
{




this
.lbInfo1.Text
=
""
;




this
.lbInfo3.Text
=
""
;




this
.lbInfo2.Text
=



System.Web.HttpContext.Current.Server.MachineName
+
"
<br/>
"




+
System.Web.HttpContext.Current.Request.ApplicationPath
+
"
<br/>
"




+
System.Web.HttpContext.Current.Request.CurrentExecutionFilePath
+
"
<br/>
"




+
System.Web.HttpContext.Current.Request.RawUrl
+
"
<br/>
"




+
System.Web.HttpContext.Current.Request.Url
+
"
<br/>
"




+
System.Web.HttpContext.Current.Request.UserHostAddress
+
"
<br/>
"




+
System.Web.HttpContext.Current.Request.UserHostName
+
"
<br/>
"




+
System.Web.HttpContext.Current.Request.RequestType
+
"
<br/>
"




+
System.Web.HttpContext.Current.Request.UrlReferrer.Host
+
"
<br/>
"




+
System.Web.HttpContext.Current.Request.UrlReferrer.HostNameType
+
"
<br/>
"




+
System.Web.HttpContext.Current.Request.Path
+
"
<br/>
"




+
System.Web.HttpContext.Current.Request.Url.Port
+
"
<br/>
"




+
System.Web.HttpContext.Current.Request.Url.IsDefaultPort.ToString()
+
"
<br/>
"




+
System.Web.HttpContext.Current.Request.Url.IsFile.ToString()
+
"
<br/>
"




+
System.Web.HttpContext.Current.Request.Url.LocalPath
+
"
<br/>
"




+
"
<br/>
"
;







}

第三种方法：可以从Request.ServerVariables的集合中获取 。获取的变量也最全。



private

void
btn_ServerVal_Click(
object
sender, System.EventArgs e)






...
{








this
.lbInfo1.Text
=
""
;




this
.lbInfo2.Text
=
""
;




int
loop1, loop2;



System.Collections.Specialized.NameValueCollection coll;






//
以下两种方式均可




//
coll=Page.Request.ServerVariables;



coll
=
System.Web.HttpContext.Current.Request.ServerVariables;




this
.lbInfo3.Text
=
""
;




//
Get names of all keys into a string array.



String[] arr1
=
coll.AllKeys;




for
(loop1
=

0
; loop1
<
arr1.Length; loop1
++
)






...
{




this
.lbInfo3.Text
+=
(
"
Key:
"

+
arr1[loop1]
+

"
<br>
"
);



String[] arr2
=
coll.GetValues(arr1[loop1]);




for
(loop2
=

0
; loop2
<
arr2.Length; loop2
++
)






...
{




this
.lbInfo3.Text
+=
(
"
Value
"

+
loop2
+

"
:
"

+
Server.HtmlEncode(arr2[loop2])
+

"
<br>
"
);



}



}



}



亦可用于 Web service

注意，以上方法获取IP未必真实。