How to write an URI string in App.Config

Question

I am making a Windows Service. The Service has to donwload something every night, and therefor I want to place the URI in the App.Config in case I late

Answer 1

& should work just fine, Wikipedia has a List of predefined entities in XML.

Answer 2

Try using: & in place of & in the url

Answer 3

You haven't properly encoded the ampersands in your URI. Remember that app.config is an XML file, so you must conform to XML's requirements for escaping (e.g. & should be &, < should be < and > should be >).

In your case, it should look like this:

<appSettings>
    <add
        key="fooUriString" 
        value="https://foo.bar.baz/download/DownloadStream?id=5486cfb8c50c9f9a2c1bc43daf7ddeed&amp;login=null&amp;password=null"
    />
</appSettings>

But in general, if you wanted to store a string that looked like "I <3 angle bra<kets & ampersands >>>" then do this:

<appSettings>
    <add
        key="someString"
        value="I &lt;3 angle bra&lt;kets &amp; ampersands &gt;&gt;&gt;"
    />
</appSettings>

void StringEncodingTest() {
    String expected = "I <3 angle bra<kets & ampersands >>>";
    String actual   = ConfigurationManager.AppSettings["someString"];
    Debug.Assert.AreEqual( expected, actual );
}