Stream Extension Class

This extension class is useful when you want to create a stream from some bytes of directly from a string

public static class StreamExtender
{
    /// <summary>
    /// Create a stream from an array of bytes
    /// </summary>
    /// <param name="streamBytes">Bytes source foe the stream</param>
    /// <returns></returns>
    public static MemoryStream CreateStreamFromBytes(this byte[] streamBytes)
    {
        var stream = new MemoryStream();
        stream.Write(streamBytes, 0, streamBytes.Length);
        stream.Seek(0, 0);
        return stream;
    }

    /// <summary>
    /// Create a stream from a string
    /// </summary>
    /// <remarks>Useful for unit testing file storage</remarks>
    /// <param name="contents">The contents to be placed in the stream</param>
    /// <returns>A memory stream with the string as contents</returns>
    public static MemoryStream CreateStreamFromString(this string contents)
    {
        byte[] encodedStreamBytes = Encoding.UTF8.GetBytes(contents);
        var stream CreateStreamFromBytes(encodedStreamBytes);
        return stream;
    }
}

Expand Environment Variables Extension

An extension to expand environment variables within a string

namespace Common.Environment.EnvironmentVariableExtension
{
  public static class StringEnvironmentVariableExtension
  {
    public static string ExpandEnvironmentVariables(this string path)
    {
        Debug.Assert(path != null);
        string result = "";
        result = Environment.ExpandEnvironmentVariables(path);
        return result;
    }
  }
}

and usage

using Common.Environment.EnvironmentVariableExtension;

[Test]
public void ExpandEnvironmentVariablesUsage()
{
    string path = "%Temp%";
    string tempPath = path.ExpandEnvironmentVariables();
}