A New Linker

Posted By admin On 29/12/21

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Note

Although .NET Core supports strong-named assemblies, and all assemblies in the .NET Core library are signed, the majority of third-party assemblies do not need strong names. For more information, see Strong Name Signing on GitHub.

There are a number of ways to sign an assembly with a strong name:

  • By using the Signing tab in a project's Properties dialog box in Visual Studio. This is the easiest and most convenient way to sign an assembly with a strong name.

  • By using the Assembly Linker (Al.exe) to link a .NET Framework code module (a .netmodule file) with a key file.

  • By using assembly attributes to insert the strong name information into your code. You can use either the AssemblyKeyFileAttribute or the AssemblyKeyNameAttribute attribute, depending on where the key file to be used is located.

  • By using compiler options.

You must have a cryptographic key pair to sign an assembly with a strong name. For more information about creating a key pair, see How to: Create a public-private key pair.

Create and sign an assembly with a strong name by using Visual Studio

  1. In Solution Explorer, open the shortcut menu for the project, and then choose Properties.

  2. Choose the Signing tab.

  3. Select the Sign the assembly box.

  4. In the Choose a strong name key file box, choose Browse, and then navigate to the key file. To create a new key file, choose New and enter its name in the Create Strong Name Key dialog box.

Note

In order to delay sign an assembly, choose a public key file.

Create and sign an assembly with a strong name by using the Assembly Linker

At the Developer Command Prompt for Visual Studio, enter the following command:

al/out:<assemblyName> <moduleName>/keyfile:<keyfileName>

Where:

  • assemblyName is the name of the strongly signed assembly (a .dll or .exe file) that Assembly Linker will emit.

  • moduleName is the name of a .NET Framework code module (a .netmodule file) that includes one or more types. You can create a .netmodule file by compiling your code with the /target:module switch in C# or Visual Basic.

  • keyfileName is the name of the container or file that contains the key pair. Assembly Linker interprets a relative path in relation to the current directory.

The following example signs the assembly MyAssembly.dll with a strong name by using the key file sgKey.snk.

For more information about this tool, see Assembly Linker.

Sign an assembly with a strong name by using attributes

  1. Add the System.Reflection.AssemblyKeyFileAttribute or AssemblyKeyNameAttribute attribute to your source code file, and specify the name of the file or container that contains the key pair to use when signing the assembly with a strong name.

  2. Compile the source code file normally.

    Note

    The C# and Visual Basic compilers issue compiler warnings (CS1699 and BC41008, respectively) when they encounter the AssemblyKeyFileAttribute or AssemblyKeyNameAttribute attribute in source code. You can ignore the warnings.

The following example uses the AssemblyKeyFileAttribute attribute with a key file called keyfile.snk, which is located in the directory where the assembly is compiled.

You can also delay sign an assembly when compiling your source file. For more information, see Delay-sign an assembly.

Sign an assembly with a strong name by using the compiler

Compile your source code file or files with the /keyfile or /delaysign compiler option in C# and Visual Basic, or the /KEYFILE or /DELAYSIGN linker option in C++. After the option name, add a colon and the name of the key file. When using command-line compilers, you can copy the key file to the directory that contains your source code files.

For information on delay signing, see Delay-sign an assembly.

The following example uses the C# compiler and signs the assembly UtilityLibrary.dll with a strong name by using the key file sgKey.snk.

See also

Links are found in nearly all web pages. Links allow users to click their way from page to page.

HTML Links - Hyperlinks

Link

HTML links are hyperlinks.

You can click on a link and jump to another document.

When you move the mouse over a link, the mouse arrow will turn into a little hand.

Note: A link does not have to be text. A link can be an image or any other HTML element!

HTML Links - Syntax

The HTML <a> tag defines a hyperlink. It has the following syntax:

The most important attribute of the <a> element is the href attribute, which indicates the link's destination.

The link text is the part that will be visible to the reader.

Clicking on the link text, will send the reader to the specified URL address.

Example

This example shows how to create a link to W3Schools.com:

<a href='https://www.w3schools.com/'>Visit W3Schools.com!</a>
Try it Yourself »

By default, links will appear as follows in all browsers:

  • An unvisited link is underlined and blue
  • A visited link is underlined and purple
  • An active link is underlined and red

Tip: Links can of course be styled with CSS, to get another look!

HTML Links - The target Attribute

By default, the linked page will be displayed in the current browser window. To change this, you must specify another target for the link.

The target attribute specifies where to open the linked document.

The target attribute can have one of the following values:

  • _self - Default. Opens the document in the same window/tab as it was clicked
  • _blank - Opens the document in a new window or tab
  • _parent - Opens the document in the parent frame
  • _top - Opens the document in the full body of the window

Example

Use target='_blank' to open the linked document in a new browser window or tab:

<a href='https://www.w3schools.com/' target='_blank'>Visit W3Schools!</a>
Try it Yourself »

Absolute URLs vs. Relative URLs

Both examples above are using an absolute URL (a full web address) in the href attribute.

A local link (a link to a page within the same website) is specified with a relative URL (without the 'https://www' part):

A new link

Example

<h2>Absolute URLs</h2>
<p><a href='https://www.w3.org/'>W3C</a></p>
<p><a href='https://www.google.com/'>Google</a></p>
<h2>Relative URLs</h2>
<p><a href='html_images.asp'>HTML Images</a></p>
<p><a href='/css/default.asp'>CSS Tutorial</a></p>
Try it Yourself »

HTML Links - Use an Image as a Link

To use an image as a link, just put the <img> tag inside the <a> tag:

Example

<a href='default.asp'>
<img src='smiley.gif' alt='HTML tutorial'>
</a>
Try it Yourself »

Link to an Email Address

Use mailto: inside the href attribute to create a link that opens the user's email program (to let them send a new email):

Example

<a href='mailto:[email protected]'>Send email</a>
Try it Yourself »

Button as a Link

To use an HTML button as a link, you have to add some JavaScript code.

JavaScript allows you to specify what happens at certain events, such as a click of a button:

Example

<button>HTML Tutorial</button>
Try it Yourself »

Tip: Learn more about JavaScript in our JavaScript Tutorial.

Link Titles

The title attribute specifies extra information about an element. The information is most often shown as a tooltip text when the mouse moves over the element.

Example

<a href='https://www.w3schools.com/html/'>Visit our HTML Tutorial</a>
Try it Yourself »

More on Absolute URLs and Relative URLs

Example

Use a full URL to link to a web page:

<a href='https://www.w3schools.com/html/default.asp'>HTML tutorial</a>

Example

A New Inheritance

Link to a page located in the html folder on the current web site:

Example

Link to a page located in the same folder as the current page:

You can read more about file paths in the chapter HTML File Paths.

Chapter Summary

  • Use the <a> element to define a link
  • Use the href attribute to define the link address
  • Use the target attribute to define where to open the linked document
  • Use the <img> element (inside <a>) to use an image as a link
  • Use the mailto: scheme inside the href attribute to create a link that opens the user's email program

HTML Link Tags

TagDescription
<a>Defines a hyperlink
Linker

For a complete list of all available HTML tags, visit our HTML Tag Reference.


A New Link