Crystal Reports Images and ASP.Net MVC

问题:

I am having trouble with Crystal Reports when using charts and images which use CrystalImageHandler.aspx. The image cannot display and I suspect this is due to a problem with MVC routing.

The path image path is similar to this:

src="/CrystalImageHandler.aspx?dynamicimage=cr_tmp_image_a8301f51-26de-4869-be9f-c3c9ad9cc85e.png"

With the URL similar to this:

localhost:01234/ViewCrystalReports.aspx?id=50

The image cannot be found prumably because it's looking in a non-existant directory. How can I change the path CrystalImageHandler.aspx is located at? I think if I were to reference from the root the problem would be solved but anything I change in Web.Config fails to work.

I should mention this is on a conventional aspx page, not a view etc

回答1:

I solve this problem editing Web.Config file

Insert the following line:

<system.web>
...
<httpHandlers>
  <add path="CrystalImageHandler.aspx" verb="GET" type="CrystalDecisions.Web.CrystalImageHandler, CrystalDecisions.Web, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"></add>
</httpHandlers>
...

*take care with write your number version (Version=xx.x.xxxx.x)

回答2:

Figured it out. The routing was interfering with the CrystalImageHandler.aspx link that was being generated. Global.aspx has the following line to tell the routing engine to ignore resource files:

routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

but this isn't a conventional resource file, it's an aspx file for some reason (anyone know why?)

adding this fixed it:

  routes.IgnoreRoute("{resource}.aspx/{*pathInfo}");

回答3:

public class CrystalImageHandlerController : Controller
{
    //
    // GET: /Reports/CrystalImageHandler.aspx

    public ActionResult Index()
    {
        return Content("");
    }

    protected override void OnActionExecuted(ActionExecutedContext filterContext)
    {

        var handler = new CrystalDecisions.Web.CrystalImageHandler();
        var app = (HttpApplication)filterContext.RequestContext.HttpContext.GetService(typeof(HttpApplication));
        if (app == null) return;

        handler.ProcessRequest(app.Context);

    }
}

This controller will invoke the handler. Just add a route to this as CrystalImageHandler.aspx, it can also be used with any sub path you'd like (in this case /reports). Something I could NEVER get the handler to do via configuration.

回答4:

To view in local machine,you will add the following code in web config

<httpHandlers>
<add verb="GET" path="CrystalImageHandler.aspx"    type="CrystalDecisions.Web.CrystalImageHandler, CrystalDecisions.Web,Version=10.2.3600.0, Culture=neutral, PublicKeyToken=692fbea5521e1304" /> 
</httpHandlers>

...............................

<appSettings>       
<add key="CrystalImageCleaner-AutoStart" value="true" />
<add key="CrystalImageCleaner-Sleep" value="60000" />
<add key="CrystalImageCleaner-Age" value="120000" />    
</appSettings>

---

The following code is for displaying in server

<system.webServer>      
<handlers>                
    <add name="CrystalImageHandler.aspx_GET" verb="GET" path="CrystalImageHandler.aspx" type="CrystalDecisions.Web.CrystalImageHandler, CrystalDecisions.Web, Version=10.2.3600.0, Culture=neutral, PublicKeyToken=692fbea5521e1304" preCondition="integratedMode"/> 
</handlers>
</system.webServer>

:) I will solve that problem in adding in web config

回答5:

It's because the routing was interfering with the CrystalImageHandler.aspx. So either in Global.asax or routeConfig file we can ignore route for .aspx extension files. You can ignore .aspx extension route by adding following line.

routes.IgnoreRoute("{allaspx}", new {allaspx=@"..aspx(/.*)?"});