C# Error
CS1708 – Fixed size buffers can only be accessed through locals or fields
Reason for the Error & Solution
Fixed size buffers can only be accessed through locals or fields
A new feature in C# 2.0 is the ability to define an in-line array inside of a struct. Such arrays can only be accessed via local variables or fields, and may not be referenced as intermediate values on the left-hand side of an expression. Also, the arrays cannot be accessed by fields that are static or readonly.
To resolve this error, define an array variable, and assign the in-line array to the variable. Or, remove the static or readonly modifier from the field representing the in-line array.
Example
The following sample generates CS1708.
// CS1708.cs
// compile with: /unsafe
using System;
unsafe public struct S
{
public fixed char name[10];
}
public unsafe class C
{
public S UnsafeMethod()
{
S myS = new S();
return myS;
}
static void Main()
{
C myC = new C();
myC.UnsafeMethod().name[3] = 'a'; // CS1708
// Uncomment the following 2 lines to resolve:
// S myS = myC.UnsafeMethod();
// myS.name[3] = 'a';
// The field cannot be static.
C._s1.name[3] = 'a'; // CS1708
// The field cannot be readonly.
myC._s2.name[3] = 'a'; // CS1708
}
static readonly S _s1;
public readonly S _s2;
}
