不同项目之间的控件共享
不同項目之間的控件共享?
????? 上篇blog我有提到,不知如何解決不用項目之間的控件共享問題.很多朋友給予了熱心的回答,這里一起表示感謝.
???????總結大家的回復,一般有2種觀點,一是做成用戶控件,二是js+css的形式.確實現在這2種方法很多見,各有優點,但也各有缺點.做成用戶控件的話,如果每次修改都要發布dll的話,無疑是非常麻煩的,而js+css也是一種非常好的方法,應該很多網站目前都是使用這個方法來共享頭部和底部的.js的方法很便捷,但是也缺少一定的靈活性.因為我們不僅僅是共享頭尾而已.
????? 比如文章的列表,不同板塊的文章會呈現不用的文章和表現形式.他們只是調用的內容和排版上有所不同,而代碼方面應該是一致的.這個時候就需要做成用戶控件了.那么該如何解決這個問題呢?
????? 我們先設想一下大概思路,不同項目之間共享控件,那么控件就應該做成一個獨立的項目,而同一個控件的代碼是一樣的(就是ascx.cs是一樣的),變現不一樣(就是ascx不一樣).
肯定有朋友會想到了,我們建立多個ascx文件,讓他們都繼承自同一個ascx.cs不久可以了嗎?
?
???????
恩,沒錯,確實是這樣的思路,但是問題在于,.NET的控件只能被同一個項目所引用,因為他只支持虛擬的相對路徑.一旦跨項目引用了就出提示錯誤.(超出了當先項目虛擬目錄的根目錄了)
???????? 經過我們Google+baidu,發現.net 2.0提供了一些類來實現自己的虛擬文件系統. 這些類在System.Web.Hosting命名空間內定義.我們只要重寫VirtualPathProvider、VirtualFile就可以把ascx放在一個統一的地方,然后各個項目都可以調用了.
?????? 具體代碼如下:
??????????
Code??1public?class?SkinVirtualPathProvider?:?VirtualPathProvider
??2
??3????{
??4
??5????????/**////?<summary>
??6
??7????????///?定義模板路徑
??8
??9????????///?</summary>
?10
?11????????public?string?VirtualPath
?12
?13????????{
?14
?15????????????get;
?16
?17????????????set;
?18
?19????????}
?20
?21?
?22
?23????????/**////?<summary>
?24
?25????????///?定義擴展名
?26
?27????????///?</summary>
?28
?29????????public?string?ExtensionString
?30
?31????????{
?32
?33????????????get;
?34
?35????????????set;
?36
?37????????}
?38
?39?
?40
?41????????private?bool?CheckPathInExtension(string?virtualPath)
?42
?43????????{
?44
?45????????????return?virtualPath.EndsWith(ExtensionString);
?46
?47????????}
?48
?49?
?50
?51????????public?override?bool?FileExists(string?virtualPath)
?52
?53????????{
?54
?55????????????return?(CheckPathInExtension(virtualPath)?||?Previous.FileExists(virtualPath));
?56
?57????????}
?58
?59?
?60
?61????????public?override?VirtualFile?GetFile(string?virtualPath)
?62
?63????????{
?64
?65????????????if?(!CheckPathInExtension(virtualPath))
?66
?67????????????????return?base.GetFile(virtualPath);
?68
?69????????????else
?70
?71????????????{
?72
?73????????????????return?new?SkinVirtualFile(this,virtualPath);
?74
?75????????????}
?76
?77????????}
?78
?79?
?80
?81????????public?override?CacheDependency?GetCacheDependency(string?virtualPath,?IEnumerable?virtualPathDependencies,?DateTime?utcStart)
?82
?83????????{
?84
?85????????????if?(CheckPathInExtension(virtualPath))
?86
?87????????????????return?new?CacheDependency(this.VirtualPath?+?"/"?+?virtualPath);
?88
?89?
?90
?91????????????else
?92
?93????????????????return?base.GetCacheDependency(virtualPath,?virtualPathDependencies,?utcStart);
?94
?95????????????
?96
?97????????}
?98
?99????}
100
101?
102
103?
104
105public?class?SkinVirtualFile:VirtualFile
106
107????{
108
109????????string?path;
110
111????????private?SkinVirtualPathProvider?provider;
112
113?
114
115????????public?SkinVirtualFile(SkinVirtualPathProvider?provider,?string?virtualPath)
116
117????????????:?base(virtualPath)
118
119????????{
120
121????????????path?=?provider.VirtualPath?+?"/"?+?virtualPath;
122
123????????????this.provider?=?provider;
124
125????????}
126
127?
128
129????????public?override?Stream?Open()
130
131????????{
132
133????????????return?new?FileStream(this.path,?FileMode.Open,?FileAccess.Read,?FileShare.Read);
134
135????????}
136
137}
138
139?
140
然后在Global里注冊一下:
Code
??1public?class?SkinVirtualPathProvider?:?VirtualPathProvider
??2
??3????{
??4
??5????????/**////?<summary>
??6
??7????????///?定義模板路徑
??8
??9????????///?</summary>
?10
?11????????public?string?VirtualPath
?12
?13????????{
?14
?15????????????get;
?16
?17????????????set;
?18
?19????????}
?20
?21?
?22
?23????????/**////?<summary>
?24
?25????????///?定義擴展名
?26
?27????????///?</summary>
?28
?29????????public?string?ExtensionString
?30
?31????????{
?32
?33????????????get;
?34
?35????????????set;
?36
?37????????}
?38
?39?
?40
?41????????private?bool?CheckPathInExtension(string?virtualPath)
?42
?43????????{
?44
?45????????????return?virtualPath.EndsWith(ExtensionString);
?46
?47????????}
?48
?49?
?50
?51????????public?override?bool?FileExists(string?virtualPath)
?52
?53????????{
?54
?55????????????return?(CheckPathInExtension(virtualPath)?||?Previous.FileExists(virtualPath));
?56
?57????????}
?58
?59?
?60
?61????????public?override?VirtualFile?GetFile(string?virtualPath)
?62
?63????????{
?64
?65????????????if?(!CheckPathInExtension(virtualPath))
?66
?67????????????????return?base.GetFile(virtualPath);
?68
?69????????????else
?70
?71????????????{
?72
?73????????????????return?new?SkinVirtualFile(this,virtualPath);
?74
?75????????????}
?76
?77????????}
?78
?79?
?80
?81????????public?override?CacheDependency?GetCacheDependency(string?virtualPath,?IEnumerable?virtualPathDependencies,?DateTime?utcStart)
?82
?83????????{
?84
?85????????????if?(CheckPathInExtension(virtualPath))
?86
?87????????????????return?new?CacheDependency(this.VirtualPath?+?"/"?+?virtualPath);
?88
?89?
?90
?91????????????else
?92
?93????????????????return?base.GetCacheDependency(virtualPath,?virtualPathDependencies,?utcStart);
?94
?95????????????
?96
?97????????}
?98
?99????}
100
101?
102
103?
104
105public?class?SkinVirtualFile:VirtualFile
106
107????{
108
109????????string?path;
110
111????????private?SkinVirtualPathProvider?provider;
112
113?
114
115????????public?SkinVirtualFile(SkinVirtualPathProvider?provider,?string?virtualPath)
116
117????????????:?base(virtualPath)
118
119????????{
120
121????????????path?=?provider.VirtualPath?+?"/"?+?virtualPath;
122
123????????????this.provider?=?provider;
124
125????????}
126
127?
128
129????????public?override?Stream?Open()
130
131????????{
132
133????????????return?new?FileStream(this.path,?FileMode.Open,?FileAccess.Read,?FileShare.Read);
134
135????????}
136
137}
138
139?
140
這里擴展名我定義的.skin,這里我們也web.config里也要注冊一下
<buildProviders>
??????? <add extension=".skin" type="System.Web.Compilation.UserControlBuildProvider"/>
????? </buildProviders>
?
如此這般操作了以后,比如項目中要使用1.skin 就會去 skin目錄下去找這個文件了,不再受到虛擬目錄的根目錄的限制了.
解決這個問題之后,我們就要修改我們的用戶控件了,讓他會load這個skin里面的內容,然后來做數據的綁定.
具體代碼我就不貼了,提供幾個參考鏈接.
參考鏈接:
1.?? http://www.cnblogs.com/cricket/articles/25299.html
2.?????? http://www.cnblogs.com/zxjay/archive/2008/11/13/xianfen_net_virtualpathprovider.html
3.?????? http://blog.csdn.net/baoaya/archive/2009/07/27/4384178.aspx
?
?
??????沒啥技術含量,主要是想分享一下解決問題的方法和思路,大家見笑了
轉載于:https://www.cnblogs.com/xinzhyu/archive/2009/09/01/1558134.html
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