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V3058. An item with the same key has al…
Analyzer Diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
MISRA errors
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Additional information
Contents

V3058. An item with the same key has already been added.

Feb 15 2015

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"); // ArgumentException

In 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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