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V3058. An item with the same key has already been added.
The analyzer detected an issue that has to do with adding values to a dictionary for a key already present in this dictionary. It will cause raising an ArgumentException at runtime with the message: "An item with the same key has already been added".
Consider the following example:
var mimeTypes = new Dictionary<string, string>();
mimeTypes.Add(".aif", "audio/aiff");
mimeTypes.Add(".aif", "audio/x-aiff"); // ArgumentExceptionIn this code, an ArgumentException will be raised when attempting to add a value for the ".aif" key for the second time.
To make this code correct, we must avoid duplicates of keys when filling the dictionary:
var mimeTypes = new Dictionary<string, string>();
mimeTypes.Add(".aif", "audio/aiff");This diagnostic is classified as:
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