对用户控件的访问方式重写
因为项目里面需要记录一下重写的方法以备后用
首先增加一个继承IHttpHandler的截获类
代码
public
class
UserControlRenderingHandler : IHttpHandler
{
public
void
ProcessRequest(HttpContext context)
{
string
fileType
=
context.Request.FilePath;
string
appRelativePath
=
context.Request.AppRelativeCurrentExecutionFilePath;
string
controlPath
=
appRelativePath.ToLower().Replace(
"
.uc
"
,
"
.ascx
"
);
ViewManager
<
UserControl
>
viewManager
=
new
ViewManager
<
UserControl
>
();
UserControl control
=
viewManager.LoadViewControl(controlPath);
SetPropertyValues(control, context);
context.Response.ContentType
=
"
text/html
"
;
context.Response.Write(viewManager.RenderView(control));
}
private
static
Dictionary
<
Type,
Dictionary
<
PropertyInfo,
List
<
UserControlRenderingPropertyAttribute
>>>
s_metadataCache
=
new
Dictionary
<
Type,
Dictionary
<
PropertyInfo,
List
<
UserControlRenderingPropertyAttribute
>>>
();
private
static
Dictionary
<
PropertyInfo,
object
>
s_defaultValueCache
=
new
Dictionary
<
PropertyInfo,
object
>
();
private
static
object
s_mutex
=
new
object
();
private
static
Dictionary
<
PropertyInfo,
List
<
UserControlRenderingPropertyAttribute
>>
GetMetadata(Type type)
{
if
(
!
s_metadataCache.ContainsKey(type))
{
lock
(s_mutex)
{
if
(
!
s_metadataCache.ContainsKey(type))
{
s_metadataCache[type]
=
LoadMetadata(type);
}
}
}
return
s_metadataCache[type];
}
private
static
Dictionary
<
PropertyInfo,
List
<
UserControlRenderingPropertyAttribute
>>
LoadMetadata(Type type)
{
Dictionary
<
PropertyInfo, List
<
UserControlRenderingPropertyAttribute
>>
result
=
new
Dictionary
<
PropertyInfo, List
<
UserControlRenderingPropertyAttribute
>>
();
PropertyInfo[] properties
=
type.GetProperties(BindingFlags.Public
|
BindingFlags.Instance
|
BindingFlags.SetProperty);
foreach
(PropertyInfo p
in
properties)
{
object
[] oo
=
p.GetCustomAttributes(
typeof
(UserControlRenderingPropertyAttribute),
true
);
if
(oo.Length
>
0
)
{
List
<
UserControlRenderingPropertyAttribute
>
list
=
new
List
<
UserControlRenderingPropertyAttribute
>
();
list.Add(((UserControlRenderingPropertyAttribute)oo[
0
]));
result[p]
=
list;
}
}
return
result;
}
private
static
object
GetDefaultValue(PropertyInfo property)
{
if
(
!
s_defaultValueCache.ContainsKey(property))
{
lock
(s_mutex)
{
if
(
!
s_defaultValueCache.ContainsKey(property))
{
object
[] attributes
=
property.GetCustomAttributes(
typeof
(DefaultValueAttribute),
true
);
object
value
=
attributes.Length
>
0
?
((DefaultValueAttribute)attributes[
0
]).Value :
null
;
s_defaultValueCache[property]
=
value;
}
}
}
return
s_defaultValueCache[property];
}
public
static
void
SetPropertyValues(UserControl control, HttpContext context)
{
Dictionary
<
PropertyInfo,
List
<
UserControlRenderingPropertyAttribute
>>
metadata
=
GetMetadata(control.GetType());
foreach
(PropertyInfo property
in
metadata.Keys)
{
object
value
=
GetValue(metadata[property], context)
??
GetDefaultValue(property);
if
(value
!=
null
)
{
property.SetValue(control, Convert.ChangeType(value, property.PropertyType),
null
);
}
}
}
private
static
object
GetValue(
IEnumerable
<
UserControlRenderingPropertyAttribute
>
metadata,
HttpContext context)
{
foreach
(UserControlRenderingPropertyAttribute att
in
metadata)
{
NameValueCollection collection
=
(att.Source
==
UserControlRenderingPropertySource.QueryString)
?
context.Request.QueryString : context.Request.Form;
object
value
=
collection[att.Key];
if
(value
!=
null
)
return
value;
}
return
null
;
}
public
bool
IsReusable
{
get
{
return
false
;
}
}
上面类相关的东西
代码
public
class
ViewManager
<
T
>
where
T : UserControl
{
private
AjaxPageBase m_pageHolder;
public
T LoadViewControl(
string
path)
{
this
.m_pageHolder
=
new
AjaxPageBase();
return
(T)
this
.m_pageHolder.LoadControl(path);
}
public
string
RenderView(T control)
{
StringWriter output
=
new
StringWriter();
this
.m_pageHolder.Controls.Add(control);
HttpContext.Current.Server.Execute(
this
.m_pageHolder, output,
true
);
return
output.ToString();
}
}
代码
public
class
AjaxPageBase : Page
{
public
override
void
VerifyRenderingInServerForm(Control control)
{
}
protected
override
void
OnError(EventArgs e)
{
}
}
下面这个是对form表单的参数截获
代码
public
enum
UserControlRenderingPropertySource
{
Form,
QueryString
}
[AttributeUsage(AttributeTargets.Property, AllowMultiple
=
true
, Inherited
=
true
)]
public
class
UserControlRenderingPropertyAttribute : Attribute
{
string
_key;
public
string
Key
{
get
{
return
_key; }
set
{ _key
=
value; }
}
UserControlRenderingPropertySource _source;
public
UserControlRenderingPropertySource Source
{
get
{
return
_source; }
set
{ _source
=
value; }
}
}
这样就将用户的控件.ascx转成.uc的方式 重新写出来了。
解决了.ascx不能直接访问的问题。
web.config的<httpHandlers>节增加
<add verb="*" path="*.uc" type="Core.Web.UserControlRenderingHandler"/>
再到IIS6中增加映射
IIS7配置
