C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;
					
public class Program
{
	public static void Main()
	{
		object oj="stella";
		var data=oj.ConvertToType<int>(false);
		Console.WriteLine(data);
	}
	
	public enum Demo{
		one=1,
		two =2
	}
}

public static class Test
{
	public static T ConvertToType<T>(this object obj, bool useDefaultValue = false)
        {
            var type = typeof(T);
            if (HasValidValue(obj))
            {
                if (!useDefaultValue)
                {
                    return OnConvertToType<T>(obj, type);
                }
                try
                {
                    return OnConvertToType<T>(obj, type);
                }
                catch (Exception) { }
            }
            return default(T);
        }
	
	private static T OnConvertToType<T>(object obj, Type type)
        {
            if (type.IsPrimitive)
            {
                return (T)Convert.ChangeType(obj, type);
            }

            Type underlyingType = Nullable.GetUnderlyingType(type);

            if (underlyingType != null)
            {
                return (T)Convert.ChangeType(obj, Nullable.GetUnderlyingType(type));
            }

            if (type.IsGenericType || type.IsInterface)
            {
                return (T)obj;
            }

            if (type.IsEnum)
            {
                var objType = obj.GetType();
                int i;
                //遇到Byte的數字的暫解方式之後再調校
                if (objType == typeof(string) && Enum.IsDefined(type, obj))
                {
                    return (T)Enum.Parse(type, obj.ToString());
                }
                else if (int.TryParse(obj.ToString(), out i) && Enum.IsDefined(type, i))
                {
                    return (T)Enum.Parse(type, i.ToString());
                }
                throw new Exception(string.Format("Enum :{0} {1} 無法轉換 ", (type.Name), (obj)));
            }

            return (T)Convert.ChangeType(obj, type);
        }
	
	  private static bool HasValidValue(object obj)
        {
            return (obj != null && !DBNull.Value.Equals(obj));
        }
}

​x
 
using System;
                    
public class Program
{
    public static void Main()
    {
        object oj="stella";
        var data=oj.ConvertToType<int>(false);
        Console.WriteLine(data);
    }
    
    public enum Demo{
        one=1,
        two =2
    }
}
​
public static class Test
{
    public static T ConvertToType<T>(this object obj, bool useDefaultValue = false)
        {
            var type = typeof(T);
            if (HasValidValue(obj))
            {
                if (!useDefaultValue)
                {
                    return OnConvertToType<T>(obj, type);
                }
                try
                {
                    return OnConvertToType<T>(obj, type);
                }
                catch (Exception) { }
            }
            return default(T);
        }
    
    private static T OnConvertToType<T>(object obj, Type type)
        {
            if (type.IsPrimitive)
            {
                return (T)Convert.ChangeType(obj, type);
            }
​
            Type underlyingType = Nullable.GetUnderlyingType(type);
​
            if (underlyingType != null)
            {
                return (T)Convert.ChangeType(obj, Nullable.GetUnderlyingType(type));
            }
​
            if (type.IsGenericType || type.IsInterface)
            {
                return (T)obj;
            }
​
            if (type.IsEnum)
            {
                var objType = obj.GetType();
                int i;
                //遇到Byte的數字的暫解方式之後再調校
                if (objType == typeof(string) && Enum.IsDefined(type, obj))
                {
                    return (T)Enum.Parse(type, obj.ToString());
                }
                else if (int.TryParse(obj.ToString(), out i) && Enum.IsDefined(type, i))
                {
                    return (T)Enum.Parse(type, i.ToString());
                }
                throw new Exception(string.Format("Enum :{0} {1} 無法轉換 ", (type.Name), (obj)));
            }
​
            return (T)Convert.ChangeType(obj, type);
        }
    
      private static bool HasValidValue(object obj)
        {
            return (obj != null && !DBNull.Value.Equals(obj));
        }
}

Super Market
Select Items
1001 - item1 - P1.00
1002 - item2 - P2.00
1003 - item3 - P3.00
1004 - item4 - P4.00
1005 - item5 - P5.00
1006 - item6 - P6.00
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1097 - item97 - P97.00
1098 - item98 - P98.00
1099 - item99 - P99.00
1100 - item100 -P100.0
Select Item ID:

Cached Result
Last Run:	10:12:33 pm
Compile:	0.173s
Execute:	0.019s
Memory:	80kb
CPU:	0.031s

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