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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";
  }
}