"Howard Hoffman" <HowardH@community.nospam> wrote in message
news:eY9TjCF9GHA.4012@TK2MSFTNGP04.phx.gbl...
>I have an ASP.NET application that uses an assembly 'A'. 'A' is strongly
>named, culture-neutral and is at version 1.1.2.444.
> I have another assembly 'P' that is built against version 1.2.3.22 of
> assembly 'A'.
>
> Is it possible for me to dynamically load assembly 'P' in my application
> such that all 'P's references to 'A' hit version 1.2.3.22, but the
> original application's calls into 'A' hit veresion 1.1.2.444?
>

"Ben Voigt" <rbv@nospam.nospam> wrote in message
news:OoD%23LyF9GHA.2364@TK2MSFTNGP02.phx.gbl...
>
> "Howard Hoffman" <HowardH@community.nospam> wrote in message
> news:eY9TjCF9GHA.4012@TK2MSFTNGP04.phx.gbl...
>>I have an ASP.NET application that uses an assembly 'A'. 'A' is strongly
>>named, culture-neutral and is at version 1.1.2.444.
>> I have another assembly 'P' that is built against version 1.2.3.22 of
>> assembly 'A'.
>>
>> Is it possible for me to dynamically load assembly 'P' in my application
>> such that all 'P's references to 'A' hit version 1.2.3.22, but the
>> original application's calls into 'A' hit veresion 1.1.2.444?
>>
> Are any instances of objects from 'A' passed between the main application
> and P?
>

""Jeffrey Tan[MSFT]"" <jetan@online.microsoft.com> wrote in message
news:4aetn$m9GHA.1860@TK2MSFTNGXA01.phx.gbl...
> Hi Howard,
>
> Yes, what you want can be achieved in .Net. This is called Side-By-Side
> execution.
>
> I have written 3 sample test projects to demonstrate your situation:
> SxSTest, AddinPrj and ClassLibrary1. The SxSTest is a winform application
> for simplicity which uses the 1.0.0.0 version of ClassLibrary1. AddinPrj
> is
> the Addin project that uses the 2.0.0.0 version of ClassLibrary1. Below is
> the test code:
>
> //ClassLibrary1 version 1.0.0.0
> namespace ClassLibrary1
> {
> public class Class1
> {
> public static int StaticMethod(int a, int b)
> {
> return a+b;
> }
> }
> }
>
> //ClassLibrary1 version 2.0.0.0
> namespace ClassLibrary1
> {
> public class Class1
> {
> public static int StaticMethod(int a, int b)
> {
> return a*b;
> }
> }
> }
>
> //AddinPrj project
> namespace AddinPrj
> {
> public class AddIn
> {
> public static int AddInMethod()
> {
> return ClassLibrary1.Class1.StaticMethod(5, 6);
> }
> }
> }
>
> //SxSTest
> private void button1_Click(object sender, System.EventArgs e)
> {
> MessageBox.Show(ClassLibrary1.Class1.StaticMethod(5, 6).ToString());
> }
>
> private void button2_Click(object sender, System.EventArgs e)
> {
> MessageBox.Show(AddinPrj.AddIn.AddInMethod().ToString());
> }
> I placed the 1.0.0.0 and 2.0.0.0 version of ClassLibrary1 in "V1" and "V2"
> subdirectory of the Exe bin folder.
>
> During the testing, I found that the Probing privatePath can not be used
> to
> notify the runtime to load the assembies with the same name. We should use
> the <codeBase> element to configure the runtime the correct loading path.
> For example, in my test scenario, the below app.config file works for me:
> <?xml version="1.0" encoding="utf-8" ?>
> <configuration>
> <runtime>
> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
> <dependentAssembly>
> <assemblyIdentity name="ClassLibrary1"
> publicKeyToken="270aa85ff6943c10" />
> <codeBase version="1.0.0.0" href="V1/ClassLibrary1.dll"/>
> <codeBase version="2.0.0.0" href="V2/ClassLibrary1.dll"/>
> </dependentAssembly>
> </assemblyBinding>
> </runtime>
> </configuration>
>
> So you may add the same syntax of <codeBase> to your Asp.net application's
> web.config file, the runtime will happily load the 2 different versions of
> assembly 'A'. I have tested above code under both .Net1.1 and .Net2.0, if
> it still does not work for you, please feel free to tell me, thanks.
>
> Finally, below is the official document regarding how the runtime locates
> the assemblies. Please note the "Multiple Assemblies with the Same Name"
> section, it means "multiple assemblies with the same name" should use
> <codeBase> as the configuration element.
> http://msdn2.microsoft.com/en-us/library/15hyw9x3.aspx
>
> Hope this helps.
>
> Best regards,
> Jeffrey Tan
> Microsoft Online Community Support
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