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# AA1300 - Parameters Should Not Be Modified #
**Report code: AA1300-ParametersShouldNotBeModified**

## Summary ##
<table>
<tr>
  <td><strong>Status</strong></td>
  <td>Implemented</td>
</tr>
<tr>
  <td><strong>Description</strong></td>
  <td>Parameters should be treated as immutable and not used as a mutable variables</td>
</tr>
<tr>
  <td><strong>Category</strong></td>
  <td><a href="ImmutabilityAnalyzers.md">Immutability Analyzers</a></td>
</tr>
<tr>
  <td><strong>Enabled by default:</strong></td>
  <td>Yes</td>
</tr>
<tr>
  <td><strong>Severity:</strong></td>
  <td>Error</td>
</tr>
</table>

## Cause ##



## How to fix violations ##

There currently aren't any implemented code-fixes for this rule.

## How to suppress violations ##

This rule can be suppressed using the following attributes: 

**[MutableParameter]**<br/>A method annotated with MutableParameter attribute is allowed to have parameters that change value (ie canbe reassigned. The parameters affected must be named in the MutableParameter attribute attribute, eg
````cs
[MutableParameter attribute("p1")]
public void F(int p1, int p2)
{
    p1 = 1;
p2 = 2;
}
````
would result in no errors over the reassignment of `p1`.
Multiple variables can be supplied to the attribute, eg [MutableParameter attribute("p1", "p2")]