此代码尝试从CSV文件中获取两列数值。
using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Text.RegularExpressions;
using System.Globalization;
namespace PredominantValues
{
class Program
{
static void Main(string[] args)
{
List<DataValues> values = File.ReadAllLines("C:\\Users\\yetih\\Desktop\\Firm_Inventory.csv")
.Skip(1)
.Select(v => DataValues.FromCSV(v))
.ToList();
int YEARHIGH = 2050;
int YEARLOW = 1700;
int PRICEHIGH = 900000;
int PRICELOW = 5000;
int maxYearBuilt = DataValues.GetMaxYearBuilt(values, YEARHIGH);
int minYearBuilt = DataValues.GetMinYearBuilt(values, YEARLOW);
int avgYearBuilt = Convert.ToInt32(values.Average(r => r.yearBuilt));
int maxPrice = DataValues.GetMaxPrice(values, PRICEHIGH);
int minPrice = DataValues.GetMinPrice(values, PRICELOW);
int avgPrice = Convert.ToInt32(values.Average(r => r.price));
Console.WriteLine("Low - Year Built: " + maxYearBuilt);
Console.WriteLine("High - Year Built: " + minYearBuilt);
Console.WriteLine("Average - Year Built: " + avgYearBuilt);
Console.WriteLine("High - Price: " + maxPrice);
Console.WriteLine("Low - Price: " + minPrice);
Console.WriteLine("Average - Price: " + avgPrice);
Console.ReadLine();
}
}
public class DataValues
{
public int yearBuilt;
public int price;
public static DataValues FromCSV(string csvLine)
{
Regex CSVParser = new Regex(",(?=(?:[^\"]*\"[^\"]*\")*(?![^\"]*\"))");
string[] values = CSVParser.Split(csvLine);
DataValues dataValues = new DataValues();
values[0] = values[0].Replace("," , "");
Console.WriteLine(values[0]);
Console.ReadLine();
decimal test = decimal.Parse(values[0], NumberStyles.AllowCurrencySymbol);
Console.WriteLine(test);
Console.WriteLine(values[1]);
Console.ReadLine();
dataValues.price = int.Parse(values[0], NumberStyles.Currency);
dataValues.yearBuilt = Convert.ToInt32(values[1]);
return dataValues;
}
public static int GetMaxYearBuilt(List<DataValues> list, int YEARHIGH)
{
int maxYearBuilt;
int index;
do
{
maxYearBuilt = list.Max(r => r.yearBuilt);
if (maxYearBuilt >= YEARHIGH)
{
index = list.FindIndex(a => a.yearBuilt == maxYearBuilt);
list.RemoveAt(index);
}
} while (maxYearBuilt >= YEARHIGH);
return maxYearBuilt;
}
public static int GetMinYearBuilt(List<DataValues> list, int YEARLOW)
{
int minYearBuilt;
int index;
do
{
minYearBuilt = list.Min(r => r.yearBuilt);
if (minYearBuilt <= YEARLOW)
{
index = list.FindIndex(a => a.yearBuilt == minYearBuilt);
list.RemoveAt(index);
}
} while (minYearBuilt <= YEARLOW);
return minYearBuilt;
}
public static int GetMaxPrice(List<DataValues> list, int PRICEHIGH)
{
int maxPrice;
int index;
do
{
maxPrice = list.Max(r => r.price);
if (maxPrice >= PRICEHIGH)
{
index = list.FindIndex(a => a.price == maxPrice);
list.RemoveAt(index);
}
} while (maxPrice >= PRICEHIGH);
return maxPrice;
}
public static int GetMinPrice(List<DataValues> list, int PRICELOW)
{
int minPrice;
int index;
do
{
minPrice = list.Min(r => r.price);
if (minPrice <= PRICELOW)
{
index = list.FindIndex(a => a.price == minPrice);
list.RemoveAt(index);
}
} while (minPrice <= PRICELOW);
return minPrice;
}
}
}
到目前为止，只有当我进入CSV文件并将第一列的格式从“Currency”更改为“General”时，我才能成功导入文件并将其拆分为列表。这两列是'Price'和'Year Built'。如果我保留'货币'格式，我会得到一个例外：“输入字符串的格式不正确”。
我尝试解析字符串以删除货币符号，但是我遇到了相同的结果。
dataValues.price = int.Parse(values[0], NumberStyles.Currency);
我想将数值存储在'dataValues.price'的'values [0]'中
答案 0 :(得分：0)
首先，让我们清理FromCSV()方法：
public class DataValues
{
public int yearBuilt;
public decimal price;
private static Regex CSVParser = new Regex(",(?=(?:[^\"]*\"[^\"]*\")*(?![^\"]*\"))");
public static DataValues FromCSV(string csvLine)
{
var result = new DataValues();
string[] values = CSVParser.Split(csvLine);
values[0] = values[0].Replace("," , "").Replace("$","");
result.price = decimal.Parse(values[0]);
result.yearBuilt = int.Parse(values[1]);
return result;
}
}
这样做，目前尚不清楚你要做什么。阅读代码，您可以找到两个字段的MAX和MIN值的方法，但是您使用的过程会排除某个范围之外的值，这种方式有时会影响其他字段，有时则不会。我怀疑您要么在记录的任何部分超出范围时要排除完整记录，要么只想排除超出范围的字段，并且不打算在GetMax / Min（）方法中引起副作用。但是，在你想要的问题中，这一点并不清楚。我这里有代码。
首先，如果要排除整个记录：
static void Main(string[] args)
{
int YEARHIGH = 2050;
int YEARLOW = 1700;
decimal PRICEHIGH = 900000m;
decimal PRICELOW = 5000m;
var values = File.ReadLines(@"C:\Users\yetih\Desktop\Firm_Inventory.csv")
.Skip(1)
.Select(v => DataValues.FromCSV(v))
.Where(r => r.yearBuilt > YEARLOW && r.yearBuilt < YEARHIGH && r.price > PRICELOW && r.price < PRICEHIGH)
.ToList();
int maxYearBuilt = values.Max(r => r.yearBuilt);
int minYearBuilt = values.Min(r => r.yearBuilt);
int avgYearBuilt = Convert.ToInt32(values.Average(r => r.yearBuilt));
decimal maxPrice = values.Max(r => r.price)
decimal minPrice = values.Min(r => r.price);
decimal avgPrice = values.Average(r => r.price);
Console.WriteLine("Low - Year Built: {0}", maxYearBuilt);
Console.WriteLine("High - Year Built: {0}", minYearBuilt);
Console.WriteLine("Average - Year Built: {0}", avgYearBuilt);
Console.WriteLine("High - Price: {0,9:C}", maxPrice);
Console.WriteLine("Low - Price: {0,9:C}", minPrice);
Console.WriteLine("Average - Price: {0,9:C}", avgPrice);
Console.ReadKey(true);
}
其次，如果您只想在每个字段中排除：
static void Main(string[] args)
{
int YEARHIGH = 2050;
int YEARLOW = 1700;
decimal PRICEHIGH = 900000m;
decimal PRICELOW = 5000m;
var values = File.ReadLines(@"C:\Users\yetih\Desktop\Firm_Inventory.csv")
.Skip(1)
.Select(v => DataValues.FromCSV(v))
.ToList();
int maxYearBuilt = values.Where(r => r.yearBuilt < YEARHIGH).Max(r => r.yearBuilt);
int minYearBuilt = values.Where(r => r.yearBuilt > YEARLOW).Min(r => r.yearBuilt);
int avgYearBuilt = Convert.ToInt32(values.Where(r => r.yearBuilt > YEARLOW && r.yearBuilt < YEARHIGH).Average(r => r.yearBuilt));
decimal maxPrice = values.Where(r => r.price < PRICEHIGH).Max(r => r.price)
decimal minPrice = values.Where(r => r.price > PRICELOW).Min(r => r.price);
decimal avgPrice = values.Where(r => r.price > PRICELOW && r.price < PRICEHIGH).Average(r => r.price);
Console.WriteLine("Low - Year Built: {0}", maxYearBuilt);
Console.WriteLine("High - Year Built: {0}", minYearBuilt);
Console.WriteLine("Average - Year Built: {0}", avgYearBuilt);
Console.WriteLine("High - Price: {0,9:C}", maxPrice);
Console.WriteLine("Low - Price: {0,9:C}", minPrice);
Console.WriteLine("Average - Price: {0,9:C}", avgPrice);
Console.ReadKey(true);
}