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Extended logic for object.ConvertTo extension method

nullableenabled
David Hall 2023-05-09 11:42:26 -06:00
parent cdd2e6c124
commit 9f4409d2fb
1 changed files with 30 additions and 1 deletions
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31
Core/Extensions/ReflectionExtensions.cs
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@ -5,6 +5,8 @@ using System.ComponentModel;
using System.Linq;
using System.Reflection;
using System.Reflection.Emit;
using System.Runtime.InteropServices;
using Vanara.InteropServices;
namespace Vanara.Extensions.Reflection
{
@ -23,6 +25,7 @@ namespace Vanara.Extensions.Reflection
/// </remarks>
public static object? ConvertTo(this object? value, Type type)
{
if (type is null) return null;
if (value is null or DBNull || value.GetType() == type)
return value;
if (type.IsEnum && value is IConvertible c)
@ -35,7 +38,33 @@ namespace Vanara.Extensions.Reflection
if (converter.CanConvertFrom(value.GetType()))
return converter.ConvertFrom(value);
return Convert.ChangeType(value, type, System.Threading.Thread.CurrentThread.CurrentCulture);
try { return Convert.ChangeType(value, type, System.Threading.Thread.CurrentThread.CurrentCulture); }
catch
{
// See if type has conversion constructor
var ci = type.GetConstructor(new[] { value.GetType() });
if (ci is not null)
return ci.Invoke(new[] { value });
// See if type has static conversion method
var mi = type.GetMethod("op_Implicit", new[] { value.GetType() }) ?? type.GetMethod("op_Explicit", new[] { value.GetType() });
if (mi is not null)
return mi.Invoke(null, new[] { value });
// If both value and type are value types, and type is smaller, try to do binary conversion
try
{
int vsz = 0;
if (Marshal.SizeOf(type) <= (vsz = Marshal.SizeOf(value.GetType())))
{
using SafeCoTaskMemHandle p = new(vsz);
Marshal.StructureToPtr(value, p, false);
return p.DangerousGetHandle().ToStructure(type, p.Size);
}
}
catch { }
return value;
}
}
/// <summary>Get a sequence of types that represent all base types and interfaces.</summary>