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Why is this an issue?

The value of a static readonly field is computed at runtime while the value of a const field is calculated at compile time, which improves performance.

This rule raises an issue when a static readonly field is initialized with a value that is computable at compile time.

As specified by Microsoft, the list of types that can have a constant value are:

C# type .Net Fwk type

bool

System.Boolean

byte

System.Byte

sbyte

System.SByte

char

System.Char

decimal

System.Decimal

double

System.Double

float

System.Single

int

System.Int32

uint

System.UInt32

long

System.Int64

ulong

System.UInt64

short

System.Int16

ushort

System.UInt16

string

System.String

Noncompliant code example

namespace myLib
{
  public class Foo
  {
    static readonly int x = 1;  // Noncompliant
    static readonly int y = x + 4; // Noncompliant
    static readonly string s = "Bar";  // Noncompliant
  }
}

Compliant solution

namespace myLib
{
  public class Foo
  {
    const int x = 1;
    const int y = x + 4;
    const string s = "Bar";
  }
}




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