到目前为止我有这样的代码：
private void button3_Click(object sender, EventArgs e)
{
label1.Visible = true;
label2.Visible = true;
var items = File.ReadAllLines("updated database folder/Resellers_Inventory.txt").
Skip(1).
Select(s =>
{
var strings = s.Split('|');
if (strings.Length != 2) throw new FormatException();
return new { Code = strings[0], Stock = Convert.ToInt32(strings[1]) };
}).
ToArray();
var compareTo = File.ReadAllLines("old database folder/ProductAll.txt").
Skip(1).
Select(s =>
{
var strings = s.Split(',');
if (strings.Length != 6) throw new FormatException();
return new { Path = strings[2].Trim('"'), Id = Convert.ToInt32(strings[3]), Name = strings[4].Trim('"'), Code = strings[5].Trim('"'), Stock = Convert.ToInt32(strings[6]) };
}).
ToArray();
string foldername = DateTime.Now.ToString("yyyy--MM--dd");
Directory.CreateDirectory("Update file of " + foldername);
string UpdeitoFailas = @"Update file of " + foldername + "/update.txt";
foreach (var item in items.Where(i => compareTo.Any(i2 => i.Code == i2.Code)))
{
if ((File.Exists(UpdeitoFailas)) && i.Stock != i2.Stock)
{
using (StreamWriter sw = new StreamWriter(UpdeitoFailas))
{
sw.Write("Product, " + i2.Path + ", " + i2.Id + ", " + i2.Name + ", " + i2.Code + ", " + i.Stock);
}
}
}
文件“Resellers_Inventory.txt”是这样的（包含数十万行）：
Order Code|Stock
ACREPAIR|1031
AF813|18
AF823|12
AFCOB11|21
AFCS300|33
AFCS3000|1
AFEM4|5
AFOMNI|17
AFOX2|-3
AFOX3|-3
AFROD|28
AFSENSOR|50
AFUF21|24
AN00001|-1
AN00002|21
AN00003|4
AN00004|4
AN00005|9
...
ProductAll.txt文件还包含数十万行，如下所示：
Action,CategoryPath,ID,Name,Code,Stock
"Product","Home > Opto-electronics > LED > Standard LED, Multicolour",2226,"KINGBRIGHT LED, 3MM, HE-RED/GRN L-93WEGW","SC07621",202
"Product","Home > Resistors > Fixed",2228,"VISHAY DRALORIC RESISTOR, 0402, 5%, 10K0 CRCW040210K0JNEAIF","RE06211",0
"Product","Home > Resistors > Fixed",2229,"VISHAY DRALORIC RESISTOR, 0402, 5%, 3R90 CRCW04023R90JNEAIF","RE06212",0
"Product","Home > Resistors > Fixed",2230,"VISHAY DRALORIC RESISTOR, 0402, 5%, 2R70 CRCW04022R70JNEAIF","RE06220",25
"Product","Home > Resistors > Fixed",2231,"VISHAY DRALORIC RESISTOR, 0402, 5%, 33R0 CRCW040233R0JNEAIF","RE06221",0
"Product","Home > Resistors > Fixed",2232,"VISHAY DRALORIC RESISTOR, 0402, 5%, 100R CRCW0402100RJNEAIF","RE06226",0
"Product","Home > IC's > Comparators",2234,"STMICROELECTRONICS IC, COMPARATOR DUAL, DIP8, 393 LM393N","SC10207",57
"Product","Home > IC's > Amplifiers > Operational",2237,"STMICROELECTRONICS OP AMP, QUAD JFET, DIP14 TL084CN","SC07929",82
"Product","Home > IC's > Amplifiers > Audio Power",2239,"NATIONAL SEMICONDUCTOR AMP, AUDIO 0.25W, DIP8, 386 LM386N-1","SC08430",83
"Product","Home > IC's > Microcontrollers",2241,"MICROCHIP 8BIT FLASH MCU, 12F675, DIP8 PIC12F675-I/P","ACREPAIR",16
...
基本上我想要创建的第三个文件看起来像ProductAll.txt，但是会有不同之处：如果在Resellers_Inventory.txt中库存与ProductAll.txt不同，那么我们写一行来更新。 txt与ProductAll.txt中的行相同，但具有来自Resellers_Inventory.txt的库存值。如果股票价值相同，我们会跳过此行，不要写入新的第三个文件。匹配行（股票）通过匹配两个文件中相同的项目代码来实现。
目前我遇到了这样的错误：
Error 1 The name 'i' does not exist in the current context C:\Users\Tutis\Documents\Visual Studio 2008\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs 90 53 WindowsFormsApplication1
Error 2 The name 'i2' does not exist in the current context C:\Users\Tutis\Documents\Visual Studio 2008\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs 90 64 WindowsFormsApplication1
Error 3 The name 'i2' does not exist in the current context C:\Users\Tutis\Documents\Visual Studio 2008\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs 94 48 WindowsFormsApplication1
Error 4 The name 'i2' does not exist in the current context C:\Users\Tutis\Documents\Visual Studio 2008\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs 94 65 WindowsFormsApplication1
Error 5 The name 'i2' does not exist in the current context C:\Users\Tutis\Documents\Visual Studio 2008\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs 94 80 WindowsFormsApplication1
Error 6 The name 'i2' does not exist in the current context C:\Users\Tutis\Documents\Visual Studio 2008\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs 94 97 WindowsFormsApplication1
Error 7 The name 'i' does not exist in the current context C:\Users\Tutis\Documents\Visual Studio 2008\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs 94 114 WindowsFormsApplication1
但即使没有这个，我也不知道如何写新的update.txt文件符号“这些行与ProductAll.txt中的行相同，只是与其他股票价值相同。
答案 0 :(得分：0)
有点难以看到代码中的内容，但您可以使用File.WriteAllLines来创建结果文件。
我昨天使用你的问题答案显示它的工作，因为我无法得到你发布的工作示例。
private void UpdateProducts()
{
ThreadPool.QueueUserWorkItem((o) =>
{
DateTime start = DateTime.Now;
List<string> updatedProducts = new List<string>();
List<string[]> stock = new List<string[]>(File.ReadAllLines("G:\\Stock.txt").Select(line => line.Split('|')));
List<string> products = new List<string>(File.ReadAllLines("G:\\Products.txt"));
updatedProducts.Add(products[0]);
SetProgress(products.Count);
foreach (var item in products)
{
if (stock.Any(s => item.Contains(s[0]) && !item.EndsWith(s[1])))
{
string[] p = item.Split(',');
int productStockIndex = Array.IndexOf(p, p.Last());
int productNameIndex = productStockIndex - 1;
string productName = p[productNameIndex].Replace("\"", "");
p[productStockIndex] = stock.First(stk => stk[0] == productName)[1];
updatedProducts.Add(string.Join(",", p));
}
UpdateProgress(updatedProducts.Count);
}
File.WriteAllLines(@"G:\Results.txt", updatedProducts.ToArray());
});
}
private void SetProgress(int maxValue)
{
base.Invoke((Action)delegate
{
progressBar1.Maximum = maxValue;
});
}
private void UpdateProgress(int value)
{
base.Invoke((Action)delegate
{
progressBar1.Value = value;
});
}
private void button1_Click(object sender, EventArgs e)
{
UpdateProducts();
}
答案 1 :(得分：0)
它似乎不适用于“ProductAll.txt”
中的数据您需要将CSV中的行分隔为逗号作为分隔符，但 KEEP 用双引号之间的逗号分隔。
String.Split（）不是这项工作的好选择。您可以使用this免费库来读取CSV文件，而不是尝试重新发明轮子。
要使用它，唯一需要做的就是添加对LumenWorks.Framework.IO.dll的引用
以下是一个示例控制台项目，使用“快速CSV阅读器”库和字典执行您想要的操作，以加快您在
using LumenWorks.Framework.IO.Csv;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
namespace TestProgram
{
class Product
{
public string Action { get; set; }
public string CategoryPath { get; set; }
public int ID { get; set; }
public string Name { get; set; }
public string Code { get; set; }
public int Stock { get; set; }
}
static class Extensions
{
public static string DoubleQuoteString(this string str)
{
return '"' + str + '"';
}
}
class Program
{
static void Main(string[] args)
{
var resellersInventoryQuery = from lineTokens in ReadCsvLines("data\\Resellers_Inventory.txt", true, '|')
select new { Code = lineTokens[0], Stock = Convert.ToInt32(lineTokens[1]) };
Dictionary<string, int> orderStock = resellersInventoryQuery.ToDictionary(kvp => kvp.Code, kvp => kvp.Stock);
var allProductsQuery = from lineTokens in ReadCsvLines("data\\ProductAll.txt", true, ',')
let product = ParseProduct(lineTokens)
select product;
using (StreamWriter sw = File.CreateText("data\\updated.txt"))
{
foreach (var product in allProductsQuery)
{
if (orderStock.ContainsKey(product.Code))
{
int newStockValue = orderStock[product.Code];
if (newStockValue != product.Stock)
{
product.Stock = orderStock[product.Code];
sw.WriteLine(ToString(product));
}
}
}
}
}
static IEnumerable<string[]> ReadCsvLines(string file, bool hasHeader, char delimiter)
{
using (CsvReader csr = new CsvReader(new StreamReader(file), hasHeader, delimiter))
{
int fieldCount = csr.FieldCount;
while (csr.ReadNextRecord())
{
List<string> lineTokens = new List<string>();
for (int i = 0; i < fieldCount; i++)
lineTokens.Add(csr[i]);
yield return lineTokens.ToArray();
}
}
}
static Product ParseProduct(string[] tokens)
{
Product product = new Product();
product.Action = tokens[0];
product.CategoryPath = tokens[1];
product.ID = Convert.ToInt32(tokens[2]);
product.Name = tokens[3];
product.Code = tokens[4];
product.Stock = Convert.ToInt32(tokens[5]);
return product;
}
static string ToString(Product product)
{
const char SEPERATOR = ',';
StringBuilder sb = new StringBuilder();
sb.Append(product.Action.DoubleQuoteString()); sb.Append(SEPERATOR);
sb.Append(product.CategoryPath.DoubleQuoteString()); sb.Append(SEPERATOR);
sb.Append(product.ID); sb.Append(SEPERATOR);
sb.Append(product.Name.DoubleQuoteString()); sb.Append(SEPERATOR);
sb.Append(product.Code.DoubleQuoteString()); sb.Append(SEPERATOR);
sb.Append(product.Stock);
return sb.ToString();
}
}
}
您可以根据需要将类放到不同的文件中。例如。将Product类移动到自己的文件。当然还要添加一些错误处理。
希望这有帮助。