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Showing content from https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca1043 below:

CA1043: Use integral or string argument for indexers (code analysis) - .NET

A type contains an indexer that uses an index type other than System.Int32, System.Int64, System.Object, or System.String.

By default, this rule only looks at externally visible types, but this is configurable.

Indexers, that is, indexed properties, should use integer or string types for the index. These types are typically used for indexing data structures and increase the usability of the library. Use of the Object type should be restricted to those cases where the specific integer or string type cannot be specified at design time. If the design requires other types for the index, reconsider whether the type represents a logical data store. If it does not represent a logical data store, use a method.

To fix a violation of this rule, change the index to an integer or string type or use a method instead of the indexer.

Suppress a warning from this rule only after carefully considering the need for the nonstandard indexer.

If you just want to suppress a single violation, add preprocessor directives to your source file to disable and then re-enable the rule.

#pragma warning disable CA1043
// The code that's violating the rule is on this line.
#pragma warning restore CA1043

To disable the rule for a file, folder, or project, set its severity to none in the configuration file.

[*.{cs,vb}]
dotnet_diagnostic.CA1043.severity = none

For more information, see How to suppress code analysis warnings.

Use the following option to configure which parts of your codebase to run this rule on.

• Include specific API surfaces

You can configure this option for just this rule, for all rules it applies to, or for all rules in this category (Design) that it applies to. For more information, see Code quality rule configuration options.

You can configure which parts of your codebase to run this rule on, based on their accessibility, by setting the api_surface option. For example, to specify that the rule should run only against the non-public API surface, add the following key-value pair to an .editorconfig file in your project:

dotnet_code_quality.CAXXXX.api_surface = private, internal

Note

Replace the XXXX part of CAXXXX with the ID of the applicable rule.

The following example shows an indexer that uses an Int32 index.

string[] Month = new string[] { "Jan", "Feb", "..." };

public string this[int index]
{
    get => Month[index];
}

Private month() As String = {"Jan", "Feb", "..."}

Default ReadOnly Property Item(index As Integer) As String
    Get
        Return month(index)
    End Get
End Property

• CA1024: Use properties where appropriate

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