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发表于 2014-6-10 17:56:37
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- /* CSVReader - a simple open source C# class library to read CSV data
- * by Andrew Stellman - http://www.stellman-greene.com/CSVReader
- *
- * StringConverter.cs - Class to convert strings to typed objects
- *
- * download the latest version: http://svn.stellman-greene.com/CSVReader
- *
- * (c) 2008, Stellman & Greene Consulting
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * * Neither the name of Stellman & Greene Consulting nor the
- * names of its contributors may be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY STELLMAN & GREENE CONSULTING ''AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL STELLMAN & GREENE CONSULTING BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
- using System;
- using System.Collections.Generic;
- namespace Com.StellmanGreene.CSVReader
- {
- /// <summary>
- /// Static class to convert strings to typed values
- /// </summary>
- public static class StringConverter
- {
- public static Type ConvertString(string value, out object convertedValue)
- {
- // First check the whole number types, because floating point types will always parse whole numbers
- // Start with the smallest types
- byte byteResult;
- if (byte.TryParse(value, out byteResult))
- {
- convertedValue = byteResult;
- return typeof(byte);
- }
- short shortResult;
- if (short.TryParse(value, out shortResult))
- {
- convertedValue = shortResult;
- return typeof(short);
- }
- int intResult;
- if (int.TryParse(value, out intResult))
- {
- convertedValue = intResult;
- return typeof(int);
- }
- long longResult;
- if (long.TryParse(value, out longResult))
- {
- convertedValue = longResult;
- return typeof(long);
- }
- ulong ulongResult;
- if (ulong.TryParse(value, out ulongResult))
- {
- convertedValue = ulongResult;
- return typeof(ulong);
- }
- // No need to check the rest of the unsigned types, which will fit into the signed whole number types
- // Next check the floating point types
- float floatResult;
- if (float.TryParse(value, out floatResult))
- {
- convertedValue = floatResult;
- return typeof(float);
- }
- // It's not clear that there's anything that double.TryParse() and decimal.TryParse() will parse
- // but which float.TryParse() won't
- double doubleResult;
- if (double.TryParse(value, out doubleResult))
- {
- convertedValue = doubleResult;
- return typeof(double);
- }
- decimal decimalResult;
- if (decimal.TryParse(value, out decimalResult))
- {
- convertedValue = decimalResult;
- return typeof(decimal);
- }
- // It's not a number, so it's either a bool, char or string
- bool boolResult;
- if (bool.TryParse(value, out boolResult))
- {
- convertedValue = boolResult;
- return typeof(bool);
- }
- char charResult;
- if (char.TryParse(value, out charResult))
- {
- convertedValue = charResult;
- return typeof(char);
- }
- convertedValue = value;
- return typeof(string);
- }
- /// <summary>
- /// Compare two types and find a type that can fit both of them
- /// </summary>
- /// <param name="typeA">First type to compare</param>
- /// <param name="typeB">Second type to compare</param>
- /// <returns>The type that can fit both types, or string if they're incompatible</returns>
- public static Type FindCommonType(Type typeA, Type typeB)
- {
- // Build the singleton type map (which will rebuild it in a typesafe manner
- // if it's not already built).
- BuildTypeMap();
- if (!typeMap.ContainsKey(typeA))
- return typeof(string);
- if (!typeMap[typeA].ContainsKey(typeB))
- return typeof(string);
- return typeMap[typeA][typeB];
- }
- // Dictionary to map two types to a common type that can hold both of them
- private static Dictionary<Type, Dictionary<Type, Type>> typeMap = null;
- // Locker object to build the singleton typeMap in a typesafe manner
- private static object locker = new object();
- /// <summary>
- /// Build the singleton type map in a typesafe manner.
- /// This map is a dictionary that maps a pair of types to a common type.
- /// So typeMap[typeof(float)][typeof(uint)] will return float, while
- /// typemap[typeof(char)][typeof(bool)] will return string.
- /// </summary>
- private static void BuildTypeMap()
- {
- lock (locker)
- {
- if (typeMap == null)
- {
- typeMap = new Dictionary<Type, Dictionary<Type, Type>>()
- {
- // Comparing byte
- {typeof(byte), new Dictionary<Type, Type>() {
- { typeof(byte), typeof(byte) },
- { typeof(short), typeof(short) },
- { typeof(int), typeof(int) },
- { typeof(long), typeof(long) },
- { typeof(ulong), typeof(ulong) },
- { typeof(float), typeof(float) },
- { typeof(double), typeof(double) },
- { typeof(decimal), typeof(decimal) },
- { typeof(bool), typeof(string) },
- { typeof(char), typeof(string) },
- { typeof(string), typeof(string) },
- }},
- // Comparing short
- {typeof(short), new Dictionary<Type, Type>() {
- { typeof(byte), typeof(short) },
- { typeof(short), typeof(short) },
- { typeof(int), typeof(int) },
- { typeof(long), typeof(long) },
- { typeof(ulong), typeof(ulong) },
- { typeof(float), typeof(float) },
- { typeof(double), typeof(double) },
- { typeof(decimal), typeof(decimal) },
- { typeof(bool), typeof(string) },
- { typeof(char), typeof(string) },
- { typeof(string), typeof(string) },
- }},
- // Comparing int
- {typeof(int), new Dictionary<Type, Type>() {
- { typeof(byte), typeof(int) },
- { typeof(short), typeof(int) },
- { typeof(int), typeof(int) },
- { typeof(long), typeof(long) },
- { typeof(ulong), typeof(ulong) },
- { typeof(float), typeof(float) },
- { typeof(double), typeof(double) },
- { typeof(decimal), typeof(decimal) },
- { typeof(bool), typeof(string) },
- { typeof(char), typeof(string) },
- { typeof(string), typeof(string) },
- }},
- // Comparing long
- {typeof(long), new Dictionary<Type, Type>() {
- { typeof(byte), typeof(long) },
- { typeof(short), typeof(long) },
- { typeof(int), typeof(long) },
- { typeof(long), typeof(long) },
- { typeof(ulong), typeof(ulong) },
- { typeof(float), typeof(float) },
- { typeof(double), typeof(double) },
- { typeof(decimal), typeof(decimal) },
- { typeof(bool), typeof(string) },
- { typeof(char), typeof(string) },
- { typeof(string), typeof(string) },
- }},
- // Comparing ulong
- {typeof(ulong), new Dictionary<Type, Type>() {
- { typeof(byte), typeof(ulong) },
- { typeof(short), typeof(ulong) },
- { typeof(int), typeof(ulong) },
- { typeof(long), typeof(ulong) },
- { typeof(ulong), typeof(ulong) },
- { typeof(float), typeof(float) },
- { typeof(double), typeof(double) },
- { typeof(decimal), typeof(decimal) },
- { typeof(bool), typeof(string) },
- { typeof(char), typeof(string) },
- { typeof(string), typeof(string) },
- }},
- // Comparing float
- {typeof(float), new Dictionary<Type, Type>() {
- { typeof(byte), typeof(float) },
- { typeof(short), typeof(float) },
- { typeof(int), typeof(float) },
- { typeof(long), typeof(float) },
- { typeof(ulong), typeof(float) },
- { typeof(float), typeof(float) },
- { typeof(double), typeof(double) },
- { typeof(decimal), typeof(decimal) },
- { typeof(bool), typeof(string) },
- { typeof(char), typeof(string) },
- { typeof(string), typeof(string) },
- }},
- // Comparing double
- {typeof(double), new Dictionary<Type, Type>() {
- { typeof(byte), typeof(double) },
- { typeof(short), typeof(double) },
- { typeof(int), typeof(double) },
- { typeof(long), typeof(double) },
- { typeof(ulong), typeof(double) },
- { typeof(float), typeof(double) },
- { typeof(double), typeof(double) },
- { typeof(decimal), typeof(decimal) },
- { typeof(bool), typeof(string) },
- { typeof(char), typeof(string) },
- { typeof(string), typeof(string) },
- }},
- // Comparing decimal
- {typeof(decimal), new Dictionary<Type, Type>() {
- { typeof(byte), typeof(decimal) },
- { typeof(short), typeof(decimal) },
- { typeof(int), typeof(decimal) },
- { typeof(long), typeof(decimal) },
- { typeof(ulong), typeof(decimal) },
- { typeof(float), typeof(decimal) },
- { typeof(double), typeof(decimal) },
- { typeof(decimal), typeof(decimal) },
- { typeof(bool), typeof(string) },
- { typeof(char), typeof(string) },
- { typeof(string), typeof(string) },
- }},
- // Comparing bool
- {typeof(bool), new Dictionary<Type, Type>() {
- { typeof(byte), typeof(string) },
- { typeof(short), typeof(string) },
- { typeof(int), typeof(string) },
- { typeof(long), typeof(string) },
- { typeof(ulong), typeof(string) },
- { typeof(float), typeof(string) },
- { typeof(double), typeof(string) },
- { typeof(decimal), typeof(string) },
- { typeof(bool), typeof(bool) },
- { typeof(char), typeof(string) },
- { typeof(string), typeof(string) },
- }},
- // Comparing char
- {typeof(char), new Dictionary<Type, Type>() {
- { typeof(byte), typeof(string) },
- { typeof(short), typeof(string) },
- { typeof(int), typeof(string) },
- { typeof(long), typeof(string) },
- { typeof(ulong), typeof(string) },
- { typeof(float), typeof(string) },
- { typeof(double), typeof(string) },
- { typeof(decimal), typeof(string) },
- { typeof(bool), typeof(string) },
- { typeof(char), typeof(char) },
- { typeof(string), typeof(string) },
- }},
- // Comparing string
- {typeof(string), new Dictionary<Type, Type>() {
- { typeof(byte), typeof(string) },
- { typeof(short), typeof(string) },
- { typeof(int), typeof(string) },
- { typeof(long), typeof(string) },
- { typeof(ulong), typeof(string) },
- { typeof(float), typeof(string) },
- { typeof(double), typeof(string) },
- { typeof(decimal), typeof(string) },
- { typeof(bool), typeof(string) },
- { typeof(char), typeof(string) },
- { typeof(string), typeof(string) },
- }},
- };
- }
- }
- }
- }
- }
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