<p>What is the C# equivalent of Delphi's <code>FillChar</code>?</p>

If I understand FillChar correctly, it sets all elements of an array to the same value, yes?
In which case, unless the value is 0, you probably have to loop:
```
```
for(int i = 0 ; i < arr.Length ; i++) {
    arr[i] = value;
}
```
```
For setting the values to the type's 0, there is
```
Array.Clear
```
Obviously, with the loop answer you can stick this code in a utility method if you need... for example, as an extension method:
```
```
public static void FillChar<T>(this T[] arr, T value) {...}
```
```
Then you can use:
```
```
int[] data = {1,2,3,4,5};
//...
data.FillChar(7);
```
```
If you
absolutely
must have block operations, then
```
Buffer.BlockCopy
```
can be used to blit data between array locatiosn - for example, you could write the first chunk, then blit it a few times to fill the bulk of the array.