我不推荐去修改这个Global文件,因为这似乎不是最佳实践。在SharePoint下,我们可以借助HttpModule来实现类似Application_Start功能。那么怎样添加HttpModule呢?无非就是两点:
具体可以看这篇文章:http://msdn.microsoft.com/en-us/library/46c5ddfy(v=vs.100).aspx
当然手动去操作config文件注册HttpModule也是可以的,但这不是最佳的实践,在SharePoint下,我们可以充分的利用Feature的FeatureActivated和FeatureDeactivating事件来动态Register/Remove HttpModule,接下来就一步一步去实现。
所以,你可以在Feature中这样定义以web.config modification对象
private const string WebConfigModificationOwner = "Mintcode.Entreperneur.AutoResourcesModule";
private static readonly SPWebConfigModification[] Modifications = {
new SPWebConfigModification()
{
// owner代表此modification的标志,可以用来移除一组modifications
Owner = WebConfigModificationOwner,
// 确保name唯一,可以用来移除一个element
Name = "add[@name='AutoResourceModule']",
// 添加一个xml节点到web.config
Type = SPWebConfigModification.SPWebConfigModificationType.EnsureChildNode,
//将此httpmodule添加到此处(iis7以上在system.webServer节点的modules)
Path = "configuration/system.webServer/modules",
//第二标志位
Sequence = 0,
// 确保此处的name和上面name相同 type=NameSpace+Class Name,Assembly Name
Value = string.Format("<add name='AutoResourceModule' type='Mintcode.Entreperneur.HttpModules.AutoResourceModule,{0}' />",Assembly.GetExecutingAssembly().FullName )
}
};
public override void FeatureActivated(SPFeatureReceiverProperties properties)
{
SPWebApplication webApp = properties.Feature.Parent as SPWebApplication;
if (webApp != null)
{
AddWebConfigModifications(webApp, Modifications);
}
}
private void AddWebConfigModifications(SPWebApplication webApp, IEnumerable<SPWebConfigModification> modifications)
{
foreach (SPWebConfigModification modification in modifications)
{
webApp.WebConfigModifications.Add(modification);
}
// 提交modifications到指定的WebApplication中
webApp.Update();
// 整个Farm应用一系列modifications
webApp.WebService.ApplyWebConfigModifications();
}
这样就动态的添加了HttpModule。
打开web.config,找到如下代码就意味着添加成功了:
<add name="AutoResourceModule" type="Mintcode.Entreperneur.HttpModules.AutoResourceModule,Mintcode.Entreperneur, Version=1.0.0.0, Culture=neutral, PublicKeyToken=0d288a74a503d5ce" />
当然,你想做的更完美的话,当Feature停止时,相应的Remove掉HttpModule。
public override void FeatureDeactivating(SPFeatureReceiverProperties properties)
{
SPWebApplication webApp = properties.Feature.Parent as SPWebApplication;
if (webApp != null)
{
RemoveWebConfigModificationsByOwner(webApp, WebConfigModificationOwner);
}
}
当Modification的Owner相同时,Remove掉:
private void RemoveWebConfigModificationsByOwner(SPWebApplication webApp, string owner)
{
Collection<SPWebConfigModification> modificationCollection = webApp.WebConfigModifications;
Collection<SPWebConfigModification> removeCollection = new Collection<SPWebConfigModification>();
int count = modificationCollection.Count;
for (int i = 0; i < count; i++)
{
SPWebConfigModification modification = modificationCollection[i];
if (modification.Owner == owner)
{
removeCollection.Add(modification);
}
}
if (removeCollection.Count > 0)
{
foreach (SPWebConfigModification modificationItem in removeCollection)
{
webApp.WebConfigModifications.Remove(modificationItem);
}
webApp.Update();
webApp.WebService.ApplyWebConfigModifications();
}
}
这样当Feature停止时,自动删除掉相应的HttpModules
现在我们已经成功添加了HttpModule,做好了前期准备,接下来再分析怎样在HttpModule的Init方法中实现类似Application_Start里初始化代码。