System.IO.Packaging

问题:

I have my project set to .NET Framework 4.0. When I add System.IO.Packaging, it says that it doesn't exist. It also doesn't show up when I try to add it as a reference to the project.

How can I add System.IO.Packaging to my C# project?

回答1:

According to a user comment on this MSDN page, you have to add a reference to the WindowsBase .Net library.

回答2:

For a C# solution in Visual Studio 2010 with .NET 4.0:

1. In your project's Solution Explorer, right-click on References and select Add References from the context menu.
2. Select Assemblies in the left-hand pane, then click the Browse button next to the File name field near the botton of the pane.
3. Browse to .NET 4.0 reference assemblies and select WindowsBase.dll. For example, on my machine (Windows 7, 64-bit) the complete path is:

C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0\WindowsBase.dll

Save the solution (especially if you're compiling from the command-line with MSBuild) and you should now be able to add the using System.IO.Packaging directive to the top of your .cs file without an error appearing.

回答3:

System.IO.Packaging is a namespace, not a reference. Most (all?) of the classes within the namespace, such as ZipPackage, are deployed in WindowsBase.dll.

Make sure you have a reference to WindowsBase.dll - if you do, you can just add: using System.IO.Packaging; to your .cs files, and you'll be fine.

Note that you can see this in the documentation for any class on MSDN. For example, in ZipPackage, it lists:

Namespace:  System.IO.Packaging
Assembly:  WindowsBase (in WindowsBase.dll)

回答4:

We can add WindowsBase.dll in Dot Net framework 3.5 as well. I am using XP machine and Path for WindowsBase.dll is

C:\Program Files\Reference Assemblies\Microsoft\Framework\.NETFramework\v3.5\Profile\Client\WindowsBase.dll

Example for using System.IO.packaging is given here -

Using System.IO.Packaging to generate a ZIP file

回答5:

The System.IO.Packaging namespace is provided by WindowsBase. When you add a reference, add WindowsBase as the reference instead of trying to find System.IO.Packaging.

回答6:

You need to add a reference to the WindowsBase.dll. System.IO.Packaging is located in there.

See this article for more details:

http://msdn.microsoft.com/en-us/library/system.io.packaging.package.aspx

回答7:

System.IO.Packaging v4.0.30319 is in WindowsBase.dll v4.0.30319

For windows 10 maybe you could found here

C:\Windows\Microsoft.NET\assembly\GAC_MSIL\WindowsBase\v4.0_4.0.0.0__31bf3856ad364e35\

回答8:

In my case I was using a ashx handler. For it to work you need to add the assembly to the project and the handler:

<%@ WebHandler Language="C#" Class="UploadExcelFile2" %>
<%@ Assembly Name="WindowsBase, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %>

This finally worked for me, tried multiple times to add WindowsBase as reference(restarted VS, restarted machine too) but still it was not working till I added this explicitly in my aspx page. I used: <%@ Assembly Name="WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %> as the dll i had referenced was version 4.0.