Folks, I was looking at the implementation of string.IsNullOrWhiteSpace in:
http://typedescriptor.net/browse/types/9331-System.String
Here is the implementation:
public static bool IsNullOrWhiteSpace(string value)
{
if (value == null)
{
return true;
}
for (int i = 0; i < value.Length; i++)
{
if (char.IsWhiteSpace(value[i]))
{
}
else
{
goto Block_2;
}
}
goto Block_3;
Block_2:
return false;
Block_3:
return true;
}
Question: Isn't this over complicated? Can't the following implementation do the same job and be easier on the eye:
bool IsNullOrWhiteSpace(string value)
{
if(value == null)
{
return true;
}
for(int i = 0; i < value.Length;i++)
{
if(!char.IsWhiteSpace(value[i]))
{
return false;
}
}
return true;
}
Is this implementation incorrect? Does it have a performance penalty?
The original code (from the reference source) is
public static bool IsNullOrWhiteSpace(String value) {
if (value == null) return true;
for(int i = 0; i < value.Length; i++) {
if(!Char.IsWhiteSpace(value[i])) return false;
}
return true;
}
You're seeing the output of a poor decompiler.
You are looking at C# that was recreated from the disassembled IL. I am sure that the actual implementation is closer to your example and does not use labels.
It must be typedescriptor's disassembler doing that.
When I look at the same function with JetBrain's dotPeek it looks like this:
public static bool IsNullOrWhiteSpace(string value)
{
if (value == null)
return true;
for (int index = 0; index < value.Length; ++index)
{
if (!char.IsWhiteSpace(value[index]))
return false;
}
return true;
}
Shown below is an extension method I needed for older versions. I am not sure where I obtained the code from:
public static class StringExtensions
{
// This is only need for versions before 4.0
public static bool IsNullOrWhiteSpace(this string value)
{
if (value == null) return true;
return string.IsNullOrEmpty(value.Trim());
}
}
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