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Add documentation for .editorconfig properties
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# Configuring StyleCop Analyzers

StyleCop Analyzers is configured using two separate mechanisms: code analysis rule set files, and **stylecop.json**.
StyleCop Analyzers can be configured using multiple separate mechanisms:

1. Code analysis rule set files

Expand All @@ -12,7 +12,11 @@ StyleCop Analyzers is configured using two separate mechanisms: code analysis ru
* Specify project-specific text, such as the name of the company and the structure to use for copyright headers
* Fine-tune the behavior of certain rules

Code analysis rule sets are the standard way to configure most diagnostic analyzers within Visual Studio. Information about creating and customizing these files can be found in the [Using Rule Sets to Group Code Analysis Rules](https://docs.microsoft.com/visualstudio/code-quality/using-rule-sets-to-group-code-analysis-rules) documentation on docs.microsoft.com.
3. **.editorconfig**

* Can be used in place of rule set files and **stylecop.json**

Code analysis rule sets have been the standard way to configure most diagnostic analyzers within Visual Studio. Information about creating and customizing these files can be found in the [Using Rule Sets to Group Code Analysis Rules](https://docs.microsoft.com/visualstudio/code-quality/using-rule-sets-to-group-code-analysis-rules) documentation on docs.microsoft.com.

An example rule set file containing the default StyleCop Analyzers configuration is available at <https://github.com/DotNetAnalyzers/StyleCopAnalyzers/blob/master/StyleCop.Analyzers/StyleCop.Analyzers.CodeFixes/rulesets/StyleCopAnalyzersDefault.ruleset>.

Expand Down Expand Up @@ -47,8 +51,7 @@ For best results, **stylecop.json** should be included in source control. This w
## Indentation

This section describes the indentation rules which can be configured in **stylecop.json**. Each of the described
properties are configured in the `indentation` object, which is shown in the following sample file.
This section describes the indentation rules which can be configured in **stylecop.json** or **.editorconfig**. Each of the described properties can be configured in the `indentation` object of the **stylecop.json** file, which is shown in the following sample.

```json
{
Expand All @@ -61,22 +64,22 @@ properties are configured in the `indentation` object, which is shown in the fol

### Basic Indentation

The following properties are used to configure basic indentation in StyleCop Analyzers.
The following properties are used in **stylecop.json** to configure basic indentation in StyleCop Analyzers.

| Property | Default Value | Minimum Version | Summary |
| --- | --- | --- | --- |
| `indentationSize` | **4** | 1.1.0 | The number of columns to use for each indentation of code. Depending on the `useTabs` and `tabSize` settings, this will be filled with tabs and/or spaces. |
| `tabSize` | **4** | 1.1.0 | The width of a hard tab character in source code. This value is used when converting between tabs and spaces. |
| `useTabs` | **false** | 1.1.0 | **true** to indent using hard tabs; otherwise, **false** to indent using spaces |

When using an **.editorconfig** file to configure StyleCop Analyzers, the basic indentation settings (`indent_size`, `tab_width` and `indent_style`) as described at editorconfig.org can be used.
> :bulb: When working in Visual Studio, the IDE will not automatically adjust editor settings according to the values in
> **stylecop.json**. To provide this functionality as well, we recommend duplicating the basic indentation settings in a
> [**.editorconfig**](http://editorconfig.org/) file. Users of the [EditorConfig](https://visualstudiogallery.msdn.microsoft.com/c8bccfe2-650c-4b42-bc5c-845e21f96328)
> **stylecop.json**. To provide this functionality, we recommend using the **.editorconfig** file instead. Users of the [EditorConfig](https://visualstudiogallery.msdn.microsoft.com/c8bccfe2-650c-4b42-bc5c-845e21f96328)
> extension for Visual Studio will not need to update their C# indentation settings in order to match your project style.
## Spacing Rules

This section describes the features of spacing rules which can be configured in **stylecop.json**. Each of the described properties are configured in the `spacingRules` object, which is shown in the following sample file.
This section describes the features of spacing rules which can be configured in **stylecop.json** or **.editorconfig**. Each of the described properties are configured in the `spacingRules` object of the **stylecop.json** file, which is shown in the following sample.

```json
{
Expand All @@ -91,7 +94,7 @@ This section describes the features of spacing rules which can be configured in
## Readability Rules

This section describes the features of readability rules which can be configured in **stylecop.json**. Each of the described properties are configured in the `readabilityRules` object, which is shown in the following sample file.
This section describes the features of readability rules which can be configured in **stylecop.json** or **.editorconfig**. Each of the described properties are configured in the `readabilityRules` object of the **stylecop.json** file, which is shown in the following sample.

```json
{
Expand All @@ -104,6 +107,8 @@ This section describes the features of readability rules which can be configured

### Aliases for Built-In Types

The following property is used in **stylecop.json** to configure aliases for built-in types.

| Property | Default Value | Minimum Version | Summary |
| --- | --- | --- | --- |
| `allowBuiltInTypeAliases` | **false** | 1.1.0-beta007 | Specifies whether aliases are allowed for built-in types. |
Expand All @@ -118,9 +123,14 @@ HRESULT hr = SomeNativeOperation(); // SA1121

The `allowBuiltInTypeAliases` configuration property can be set to `true` to allow cases like this while continuing to report diagnostics for direct references to the metadata type name, `Int32`.

When using an **.editorconfig** file to configure StyleCop Analyzers, the following property can be used:
```ini
stylecop.readability.allowBuiltInTypeAliases = true
```

## Ordering Rules

This section describes the features of ordering rules which can be configured in **stylecop.json**. Each of the described properties are configured in the `orderingRules` object, which is shown in the following sample file.
This section describes the features of ordering rules which can be configured in **stylecop.json** or **.editorconfig**. Each of the described properties are configured in the `orderingRules` object of the **stylecop.json** file, which is shown in the following sample.

```json
{
Expand All @@ -133,7 +143,7 @@ This section describes the features of ordering rules which can be configured in

### Element Order

The following properties are used to configure element ordering in StyleCop Analyzers.
The following properties are used in **stylecop.json** to configure element ordering in StyleCop Analyzers.

| Property | Default Value | Minimum Version | Summary |
| --- | --- | --- | --- |
Expand Down Expand Up @@ -194,16 +204,25 @@ rules remain enforced.
}
```

> :bulb: This property can currently not be set in an **.editorconfig** file.
### Using Directives

The following properties are used to configure using directives in StyleCop Analyzers.
The following properties are used in **stylecop.json** to configure using directives in StyleCop Analyzers.

| Property | Default Value | Minimum Version | Summary |
| --- | --- | --- | --- |
| `systemUsingDirectivesFirst` | true | 1.0.0 | Specifies whether `System` using directives are placed before other using directives |
| `usingDirectivesPlacement` | `"insideNamespace"` | 1.0.0 | Specifies the desired placement of using directives |
| `blankLinesBetweenUsingGroups` | `"allow"` | 1.1.0 | Specifies is blank lines are required to separate groups of using statements |

When using an **.editorconfig** file to configure StyleCop Analyzers, the respective properties for [formatting .NET/C#](https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/style-rules/formatting-rules) can be used:
```ini
dotnet_sort_system_directives_first = true
csharp_using_directive_placement = inside_namespace
dotnet_separate_import_directive_groups = true
```

#### Using Directives Placement

The `usingDirectivesPlacement` property affects the behavior of the following rules which report incorrectly placed
Expand Down Expand Up @@ -281,7 +300,7 @@ In this mode, a blank line between groups for using directives is *not allowed*.

## Naming Rules

This section describes the features of naming rules which can be configured in **stylecop.json**. Each of the described properties are configured in the `namingRules` object, which is shown in the following sample file.
This section describes the features of naming rules which can be configured in **stylecop.json** or **.editorconfig**. Each of the described properties are configured in the `namingRules` object of the **stylecop.json** file, which is shown in the following sample.

```json
{
Expand All @@ -294,7 +313,7 @@ This section describes the features of naming rules which can be configured in *

### Hungarian Notation

The following properties are used to configure allowable Hungarian notation prefixes in StyleCop Analyzers.
The following properties are used in **stylecop.json** to configure allowable Hungarian notation prefixes in StyleCop Analyzers.

| Property | Default Value | Minimum Version | Summary |
| --- | --- | --- | --- |
Expand All @@ -316,9 +335,15 @@ The following example shows a settings file which allows the common prefixes as
}
```

When using an **.editorconfig** file to configure StyleCop Analyzers, the following properties can be used:
```ini
stylecop.naming.allowCommonHungarianPrefixes = true
stylecop.naming.allowedHungarianPrefixes = cd, md
```

### Namespace Components

The following property is used to configure allowable namespace components (e.g. ones that start with a lowercase letter).
The following property is used in **stylecop.json** to configure allowable namespace components (e.g. ones that start with a lowercase letter).

| Property | Default Value | Minimum Version | Summary |
| --- | --- | --- | --- |
Expand All @@ -339,10 +364,14 @@ The following example shows a settings file which allows namespace components su
}
```

When using an **.editorconfig** file to configure StyleCop Analyzers, the following property can be used:
```ini
stylecop.naming.allowedNamespaceComponents = eBay, iPod
```

### Tuple element names

The following properties are used to configure the behavior of the tuple element name analyzers.
The following properties are used in **stylecop.json** to configure the behavior of the tuple element name analyzers.

| Property | Default Value | Minimum Version | Summary |
| --- | --- | --- | --- |
Expand All @@ -362,6 +391,12 @@ The following example shows a settings file which requires tuple element names t
}
```

When using an **.editorconfig** file to configure StyleCop Analyzers, the following properties can be used:
```ini
stylecop.naming.includeInferredTupleElementNames = true
stylecop.naming.tupleElementNameCasing = camelCase
```

#### Tuple Element Name Casing
The `tupleElementNameCasing` property affects the behavior of the [SA1316 Tuple element names should use correct casing](SA1316.md) analyzer.

Expand All @@ -376,7 +411,7 @@ In this mode, tuple element names must start with an uppercase letter.

## Maintainability Rules

This section describes the features of maintainability rules which can be configured in **stylecop.json**. Each of the described properties are configured in the `maintainabilityRules` object, which is shown in the following sample file.
This section describes the features of maintainability rules which can be configured in **stylecop.json** or **.editorconfig**. Each of the described properties are configured in the `maintainabilityRules` object of the **stylecop.json** file, which is shown in the following sample.

```json
{
Expand All @@ -387,7 +422,7 @@ This section describes the features of maintainability rules which can be config
}
```

The following properties are used to configure maintainability rules in StyleCop Analyzers.
The following properties are used in **stylecop.json** to configure maintainability rules in StyleCop Analyzers.

| Property | Default Value | Minimum Version | Summary |
| --- | --- | --- | --- |
Expand All @@ -401,9 +436,11 @@ according to rule SA1402. The following types are supported:
* `enum`
* `delegate`

> :bulb: This property can currently not be set in an **.editorconfig** file.
## Layout Rules

This section describes the features of layout rules which can be configured in **stylecop.json**. Each of the described properties are configured in the `layoutRules` object, which is shown in the following sample file.
This section describes the features of layout rules which can be configured in **stylecop.json** or **.editorconfig**. Each of the described properties are configured in the `layoutRules` object of the **stylecop.json** file, which is shown in the following sample.

```json
{
Expand All @@ -414,14 +451,20 @@ This section describes the features of layout rules which can be configured in *
}
```

The following properties are used to configure layout rules in StyleCop Analyzers.
The following properties are used in **stylecop.json** to configure layout rules in StyleCop Analyzers.

| Property | Default Value | Minimum Version | Summary |
| --- | --- | --- | --- |
| `newlineAtEndOfFile` | `"allow"` | 1.0.0 | Specifies the handling for newline characters which appear at the end of a file |
| `allowConsecutiveUsings` | `true` | 1.1.0 | Specifies if SA1519 will allow consecutive using statements without braces |
| `allowDoWhileOnClosingBrace` | `false` | >1.2.0 | Specifies if SA1500 will allow the `while` expression of a `do`/`while` loop to be on the same line as the closing brace, as is generated by the default code snippet of Visual Studio |

When using an **.editorconfig** file to configure StyleCop Analyzers, the newline setting (`insert_final_newline`) as described at editorconfig.org can be used, and the following additional properties:
```ini
stylecop.layout.allowConsecutiveUsings = true
stylecop.layout.allowDoWhileOnClosingBrace = false
```

### Lines at End of File

The behavior of [SA1518](SA1518.md) can be customized regarding the manner in which newline characters at the end of a
Expand Down Expand Up @@ -451,7 +494,7 @@ The behavior of [SA1500](SA1500.md) can be customized regarding the manner in wh

## Documentation Rules

This section describes the features of documentation rules which can be configured in **stylecop.json**. Each of the described properties are configured in the `documentationRules` object, which is shown in the following sample file.
This section describes the features of documentation rules which can be configured in **stylecop.json** or **.editorconfig**. Each of the described properties are configured in the `documentationRules` object of the **stylecop.json** file, which is shown in the following sample.

```json
{
Expand All @@ -464,7 +507,7 @@ This section describes the features of documentation rules which can be configur

### Copyright Headers

The following properties are used to configure copyright headers in StyleCop Analyzers.
The following properties are used in **stylecop.json** to configure copyright headers in StyleCop Analyzers.

| Property | Default Value | Minimum Version | Summary |
| --- | --- | --- | --- |
Expand All @@ -474,6 +517,18 @@ The following properties are used to configure copyright headers in StyleCop Ana
| `variables` | n/a | 1.0.0 | Specifies replacement variables which can be referenced in the `copyrightText` value |
| `headerDecoration` | n/a | 1.1.0 | This value can be set to add a decoration for the header comment so headers look similar to the ones generated by the StyleCop Classic ReSharper fix |

When using an **.editorconfig** file to configure StyleCop Analyzers, the following properties can be used:
```ini
stylecop.documentation.companyName = PlaceholderCompany
stylecop.documentation.copyrightText = Copyright (c) {companyName}. All rights reserved.
stylecop.documentation.xmlHeader = true
stylecop.documentation.headerDecoration = -----------------
```

> :memo: Instead of `stylecop.documentation.copyrightText` the `file_header_template` property as described in [IDE0073 (Require file header)](https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/style-rules/ide0073) can be used. However the StyleCop specific property will take precedence.
> :bulb: The `variables` property can currently not be set in an **.editorconfig** file.
#### Configuring Copyright Text

In order to successfully use StyleCop-checked file headers, most projects will need to configure the `companyName`
Expand Down Expand Up @@ -602,6 +657,15 @@ The following example shows a configuration file which requires developers to do
}
```

When using an **.editorconfig** file to configure StyleCop Analyzers, the following properties can be used:
```ini
stylecop.documentation.documentInterfaces = true
stylecop.documentation.documentExposedElements = true
stylecop.documentation.documentInternalElements = true
stylecop.documentation.documentPrivateElements = false
stylecop.documentation.documentPrivateFields = false
```

### Documentation Culture

Some documentation rules require summary texts to start with specific strings. To allow teams to document their code in their native language, **stylecop.json** contains the `documentationCulture` property.
Expand Down Expand Up @@ -640,9 +704,19 @@ The following values are currently supported. Unsupported values will automatica
}
```

When using an **.editorconfig** file to configure StyleCop Analyzers, the following property can be used:
```ini
stylecop.documentation.documentationCulture = de-DE
```

### File naming conventions

The `fileNamingConvention` property will determine how the [SA1649 File name should match type name](SA1649.md) analyzer will check file names.
The `fileNamingConvention` property in **stylecop.json** will determine how the [SA1649 File name should match type name](SA1649.md) analyzer will check file names.

| Property | Default Value | Minimum Version | Summary |
| --- | --- | --- | --- |
| `fileNamingConvention` | `"stylecop"` | 1.0.0 | Specifies the convention for file names of generics. |

Given the following code:

```csharp
Expand All @@ -658,14 +732,24 @@ File naming convention | Expected file name
stylecop | Class1{T1,T2,T3}.cs
metadata | Class1`3.cs

When using an **.editorconfig** file to configure StyleCop Analyzers, the following property can be used:
```ini
stylecop.documentation.fileNamingConvention = stylecop
```

### Text ending with a period

The [SA1629 Documentation Text Must End With A Period](SA1629.md) analyzer checks if sections within XML documentation end with a period. The following properties can be used to control the behavior of the analyzer:
The [SA1629 Documentation Text Must End With A Period](SA1629.md) analyzer checks if sections within XML documentation end with a period. The following properties can be used in **stylecop.json** to control the behavior of the analyzer:

| Property | Default Value | Minimum Version | Summary |
| --- | --- | --- | --- |
| `excludeFromPunctuationCheck` | `[ "seealso" ]` | 1.1.0 | Specifies the top-level tags within XML documentation that will be excluded from analysis. |

When using an **.editorconfig** file to configure StyleCop Analyzers, the following property can be used:
```ini
stylecop.documentation.excludeFromPunctuationCheck = seealso
```

## Sharing configuration among solutions

It is possible to define your preferred configuration once and reuse it across multiple independent projects. This involves rolling out your own NuGet package,
Expand Down

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