basenumberconverter.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / System / ComponentModel / basenumberconverter.cs / 1 / basenumberconverter.cs
                        

                        
                             
//------------------------------------------------------------------------------
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
//  
//-----------------------------------------------------------------------------
 
/* 
 */
namespace System.ComponentModel { 
    using Microsoft.Win32;
    using System.Diagnostics;
    using System.Globalization;
    using System.Runtime.InteropServices; 
    using System.Runtime.Remoting;
    using System.Runtime.Serialization.Formatters; 
    using System.Security.Permissions; 

    ///  
    ///    Provides a base type converter for integral types.
    /// 
    [HostProtection(SharedState = true)]
    public abstract class BaseNumberConverter : TypeConverter { 

 
        ///  
        /// Determines whether this editor will attempt to convert hex (0x or #) strings
        ///  
        internal virtual bool AllowHex {
                get {
                     return true;
                } 
        }
 
 
        /// 
        /// The Type this converter is targeting (e.g. Int16, UInt32, etc.) 
        /// 
        internal abstract Type TargetType {
                get;
        } 

        ///  
        /// Convert the given value to a string using the given radix 
        /// 
        internal abstract object FromString(string value, int radix); 

        /// 
        /// Convert the given value to a string using the given formatInfo
        ///  
        internal abstract object FromString(string value, NumberFormatInfo formatInfo);
 
        ///  
        /// Convert the given value to a string using the given CultureInfo
        ///  
        internal abstract object FromString(string value, CultureInfo culture);

        /// 
        /// Create an error based on the failed text and the exception thrown. 
        /// 
        internal virtual Exception FromStringError(string failedText, Exception innerException) { 
                return new Exception(SR.GetString(SR.ConvertInvalidPrimitive, failedText, TargetType.Name), innerException); 
        }
 
        /// 
        /// Convert the given value from a string using the given formatInfo
        /// 
        internal abstract string ToString(object value, NumberFormatInfo formatInfo); 

        ///  
        ///    Gets a value indicating whether this converter can convert an object in the 
        ///       given source type to a 64-bit signed integer object using the specified context.
        ///  
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) {
            if (sourceType == typeof(string)) {
                return true;
            } 
            return base.CanConvertFrom(context, sourceType);
        } 
 
        /// 
        ///    Converts the given value object to a 64-bit signed integer object. 
        /// 
        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) {
            if (value is string) {
                string text = ((string)value).Trim(); 

                try { 
                    if (AllowHex && text[0] == '#') { 
                        return FromString(text.Substring(1), 16);
                    } 
                    else if (AllowHex && text.StartsWith("0x")
                             || text.StartsWith("0X")
                             || text.StartsWith("&h")
                             || text.StartsWith("&H")) { 
                        return FromString(text.Substring(2), 16);
                    } 
                    else { 
                        if (culture == null) {
                            culture = CultureInfo.CurrentCulture; 
                        }
                        NumberFormatInfo formatInfo = (NumberFormatInfo)culture.GetFormat(typeof(NumberFormatInfo));
                        return FromString(text, formatInfo);
                    } 
                }
                catch (Exception e) { 
                    throw FromStringError(text, e); 
                }
                catch { throw; } 
            }
            return base.ConvertFrom(context, culture, value);
        }
 
        /// 
        ///    Converts the given value object to a 64-bit signed integer object using the 
        ///       arguments. 
        /// 
        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { 
            if (destinationType == null) {
                throw new ArgumentNullException("destinationType");
            }
 
            if (destinationType == typeof(string) && value != null && TargetType.IsInstanceOfType(value)) {
 
                if (culture == null) { 
                    culture = CultureInfo.CurrentCulture;
                } 
                NumberFormatInfo formatInfo = (NumberFormatInfo)culture.GetFormat(typeof(NumberFormatInfo));
                return ToString(value, formatInfo);
            }
 
            if (destinationType.IsPrimitive) {
                return Convert.ChangeType(value, destinationType, culture); 
            } 
            return base.ConvertTo(context, culture, value, destinationType);
        } 

        public override bool CanConvertTo(ITypeDescriptorContext context, Type t) {
            if (base.CanConvertTo(context, t) || t.IsPrimitive) {
                return true; 
            }
            return false; 
        } 
    }
}

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