Fix several new CA1830 diagnostics#121131
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Pull Request Overview
This PR addresses CA1830 code analyzer diagnostics by replacing inefficient new string(char, int) constructor calls with the more performant StringBuilder.Append(char, int) overload across multiple files in the codebase. This analyzer rule recommends using StringBuilder.Append(char, int) instead of creating temporary string objects when appending repeated characters.
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| File | Description |
|---|---|
| src/tools/illink/src/linker/Linker/Driver.cs | Updated backslash appending in response file parsing to use the optimized Append overload |
| src/libraries/System.Text.RegularExpressions/src/System/Text/RegularExpressions/RegexNode.cs | Modified indentation string building in ToString() to use the optimized Append overload |
| src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CustomConverterTests/CustomConverterTests.ReadAhead.cs | Updated test string generation to use the optimized Append overload |
| src/coreclr/tools/Common/Compiler/ProcessLinkerXmlBase.cs | Changed array rank comma separator generation to use the optimized Append overload |
| src/coreclr/tools/Common/Compiler/DisplayNameHelpers.cs | Changed array rank comma separator generation to use the optimized Append overload |
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From updates in dotnet/sdk#51215