dotnet/dotnet-api-docs.System.ComponentModel projects spitting lotsa Warnings/Messages

[DickBaker]

Describe the issue or suggestion

Study of "System.ComponentModel" projects in github.com/dotnet/dotnet-api-docs ..

1. of the 84 projects, "<TargetFramework>.." need changing [assuming MS prefer LTS v8] :-
   76x from "net6.0-windows" to "net8.0-windows"
   8x from "net6.0" to "net8.0"

2. on applying all the Analyzer recommendations (lightbulbs), e.g.
   IDE300 Collection initialization can be simplified
   to WinForms projects, e.g.
   dotnet-api-docs\snippets\csharp\System.ComponentModel\AmbientValueAttribute\Overview\form1.cs
   from numericUpDown1.Maximum = new decimal(new int[] { 1410065408, 2, 0, 0 });
   to numericUpDown1.Maximum = new decimal([1410065408, 2, 0, 0]);
   the build succeeds but GUI Designer fails
   The designer cannot process the code at line 197, please see the Task List for details. The code within the method 'InitializeComponent' is generated by the designer and should not be manually modified. Please remove any changes and try opening the designer again.

3. ditto dotnet-api-docs\snippets\csharp\System.ComponentModel\AmbientValueAttribute\Overview\attributesdemocontrol.cs
   from DataGridViewCellStyle dataGridViewCellStyle1 = new DataGridViewCellStyle();
   to DataGridViewCellStyle dataGridViewCellStyle1 = new();

4. ditto dotnet-api-docs\snippets\csharp\System.ComponentModel\AsyncCompletedEventArgs\Overview\primenumbercalculatormain.cs line 472 from

       listView1.Columns.AddRange(new ColumnHeader[] {
                testNumberColHeader,
                progressColHeader,
                currentColHeader,
                taskIdColHeader,
                resultColHeader,
                firstDivisorColHeader});

to

       listView1.Columns.AddRange([
            testNumberColHeader,
            progressColHeader,
            currentColHeader,
            taskIdColHeader,
            resultColHeader,
            firstDivisorColHeader]);

5. ditto dotnet-api-docs\snippets\csharp\System.ComponentModel\BackgroundWorker\IsBusy\Form1.cs lines 230, 235, 243

6. for 2-5 above the Designer should correctly parse the latest valid C# code [like the CSC build engine does]
   otherwise should emit
   // <auto-generated> ..
   to inhibit Analyzers refactoring such fragile code

7. BTW the error text displayed in 2-5 above is omitted in the docs at Windows Forms Designer error page

I am working on PR #10965 to address most of these gripes [expect soon], so suggest MS holds off remediation

hoping that product owners will accept [mostly or cherry-pick] such contribution to improve the docs !

except many (12) Warnings [that I will not attempt to re-code as better attempted by domain experts]
CS0618 'RecommendedAsConfigurableAttribute' is obsolete: 'RecommendedAsConfigurableAttribute has been deprecated. Use System.ComponentModel.SettingsBindableAttribute instead.'

summary of various Warnings/Messages issued on build of these 84 projects [I hacked together a dick.SLN]

Warning	Message	Code	Description
0	12	CA1507	Using nameof helps keep your code valid when refactoring.
0	1	CA1510	Throw helpers are simpler and more efficient than an if block constructing a new exception instance.
0	22	CA1822	Members that do not access instance data or call instance methods can be marked as static ..
0	1	CA1824	The NeutralResourcesLanguage attribute informs the ResourceManager of the language ..
0	4	CA1825	Avoid unnecessary zero-length array allocations. Use Array.Empty() instead.
0	1	CA1830	StringBuilder.Append and StringBuilder.Insert provide overloads for multiple types beyond System.String ..
0	1	CA1847	'string.Contains(char)' is available as a better performing overload for single char lookup.
0	4	CA1859	Using concrete types avoids virtual or interface call overhead and enables inlining.
0	7	CA1861	Constant arrays passed as arguments are not reused when called repeatedly ..
0	1	CA1862	Avoid calling 'ToLower', 'ToUpper', 'ToLowerInvariant' and 'ToUpperInvariant' to perform case-insensitive string comparisons ..
0	2	CA2208	A call is made to the default (parameterless) constructor of an exception type that is or derives from ArgumentException ..
12	0	CS0618	'RecommendedAsConfigurableAttribute' is obsolete: 'RecommendedAsConfigurableAttribute has been deprecated. Use System.ComponentModel.SettingsBindableAttribute instead.'
15	0	CS0649	Field 'Form1.components' is never assigned to, and will always have its default value null
0	1	IDE0018	Variable declaration can be inlined
0	5	IDE0019	Use pattern matching
0	3	IDE0028	Collection initialization can be simplified
0	10	IDE0031	Null check can be simplified
0	16	IDE0032	Use auto property
0	2	IDE0036	Modifiers are not ordered
0	1	IDE0038	Use pattern matching
0	61	IDE0044	Make field readonly
0	37	IDE0049	Name can be simplified
0	7	IDE0059	Avoid unnecessary value assignments in your code ..
0	4	IDE0060	Avoid unused parameters in your code ..
0	18	IDE0065	Using directives must be placed outside of a namespace declaration
0	1	IDE0074	Use compound assignment
0	1	IDE0083	Use pattern matching
0	60	IDE0090	'new' expression can be simplified
0	40	IDE0130	Namespace "BackgroundWorkerExample" does not match folder structure, expected "backgroundworkersimple"
0	2	IDE0290	Use primary constructor
0	1	IDE0300	Collection initialization can be simplified
0	8	IDE1005	Delegate invocation can be simplified.
0	235	IDE1006	Naming rule violation: Missing prefix: '_'
0	2	RCS1001	Add braces to for statement (when expression spans over multiple lines)
0	11	RCS1015	Use nameof operator
0	30	RCS1032	Remove redundant parentheses
0	1	RCS1033	Remove redundant '== true'
0	22	RCS1036	([deprecated] Use RCS0063 instead) Remove unnecessary blank line
0	402	RCS1037	Remove trailing white-space
0	2	RCS1047	Remove suffix 'Async' from non-asynchronous method name
0	2	RCS1073	Convert 'if' to 'return' statement
0	11	RCS1085	Use auto-implemented property
0	3	RCS1097	Remove redundant 'ToString' call
0	3	RCS1098	Constant values should be placed on right side of comparisons
9	0	RCS1102	Make class static
0	55	RCS1110	Declare 'DemoControlDesigner' inside namespace
0	1	RCS1113	Use 'string.IsNullOrEmpty' method
0	62	RCS1114	Remove redundant delegate creation
0	35	RCS1118	Mark local variable as const
0	1	RCS1132	Remove redundant overriding method
1	0	RCS1139	Add summary element to documentation comment
0	12	RCS1146	Use conditional access
1	0	RCS1155	Use StringComparison when comparing strings
0	2	RCS1159	Use EventHandler
0	2	RCS1160	Abstract type should not have public constructors
0	8	RCS1163	Unused parameter 'args'
0	54	RCS1169	Make field read-only
0	1	RCS1179	Unnecessary assignment
0	2	RCS1192	Unnecessary usage of verbatim string literal
0	8	RCS1212	Remove redundant assignment
0	29	RCS1213	Remove unused method declaration
0	1	RCS1220	Use pattern matching instead of combination of 'is' operator and cast operator
0	1	RCS1225	Make class sealed
0	1	RCS1226	Add paragraph to documentation comment
-	-	-	-
38	2481		subtotals