AppContextConfigHelper.cs

Go to the documentation of this file.

using System.Globalization;
 
namespace System;
 
internal static class AppContextConfigHelper
{
    internal static bool GetBooleanConfig(string configName, bool defaultValue)
    {
        if (!AppContext.TryGetSwitch(configName, out var isEnabled))
        {
            return defaultValue;
        }
        return isEnabled;
    }
 
    internal static bool GetBooleanConfig(string switchName, string envVariable, bool defaultValue = false)
    {
        if (!AppContext.TryGetSwitch(switchName, out var isEnabled))
        {
            string environmentVariable = Environment.GetEnvironmentVariable(envVariable);
            return (environmentVariable == null) ? defaultValue : (bool.IsTrueStringIgnoreCase(environmentVariable) || environmentVariable.Equals("1"));
        }
        return isEnabled;
    }
 
    internal static int GetInt32Config(string configName, int defaultValue, bool allowNegative = true)
    {
        try
        {
            object data = AppContext.GetData(configName);
            int num = defaultValue;
            if (!(data is uint num2))
            {
                if (data is string text)
                {
                    num = ((!text.StartsWith('0')) ? int.Parse(text, NumberStyles.AllowLeadingSign, NumberFormatInfo.InvariantInfo) : ((text.Length < 2 || text[1] != 'x') ? Convert.ToInt32(text, 8) : Convert.ToInt32(text, 16)));
                }
                else if (data is IConvertible convertible)
                {
                    num = convertible.ToInt32(NumberFormatInfo.InvariantInfo);
                }
            }
            else
            {
                num = (int)num2;
            }
            return (!allowNegative && num < 0) ? defaultValue : num;
        }
        catch (FormatException)
        {
            return defaultValue;
        }
        catch (OverflowException)
        {
            return defaultValue;
        }
    }
 
    internal static short GetInt16Config(string configName, short defaultValue, bool allowNegative = true)
    {
        try
        {
            object data = AppContext.GetData(configName);
            short num = defaultValue;
            if (!(data is uint num2))
            {
                if (data is string text)
                {
                    num = (text.StartsWith("0x") ? Convert.ToInt16(text, 16) : ((!text.StartsWith("0")) ? short.Parse(text, NumberStyles.AllowLeadingSign, NumberFormatInfo.InvariantInfo) : Convert.ToInt16(text, 8)));
                }
                else if (data is IConvertible convertible)
                {
                    num = convertible.ToInt16(NumberFormatInfo.InvariantInfo);
                }
            }
            else
            {
                num = (short)num2;
                if ((uint)num != num2)
                {
                    return defaultValue;
                }
            }
            return (!allowNegative && num < 0) ? defaultValue : num;
        }
        catch (FormatException)
        {
            return defaultValue;
        }
        catch (OverflowException)
        {
            return defaultValue;
        }
    }
}