如何读取包含一行多条记录的文件-C#
我有一个只有一行的文本文件。每个文件包含一个客户名称，但包含多个项目和说明。如何读取包含一行多条记录的文件-C#,c#,asp.net,filestream,C#,Asp.net,Filestream,我有一个只有一行的文本文件。每个文件包含一个客户名称，但包含多个项目和说明。 以00（公司名称）开头的记录的字符长度为10 01（项目#）-字符长度为10 02（说明）-字符长度为50 我知道如何读取文件，但我不知道如何仅循环一行，查找记录00、01、02并根据长度抓取文本，最后从最后一条记录的位置开始，然后再次开始循环。有人能告诉我怎么读这样的文件吗 输出： companyName 16622 Description companyName 15522
以00（公司名称）开头的记录的字符长度为10
01（项目#）-字符长度为10
02（说明）-字符长度为50
我知道如何读取文件，但我不知道如何仅循环一行，查找记录00、01、02并根据长度抓取文本，最后从最后一条记录的位置开始，然后再次开始循环。有人能告诉我怎么读这样的文件吗 输出：
companyName 16622 Description
companyName 15522 Description
00Init 0115522 02Description 0116622 02Description
如果将整个文件读入一个字符串，则有几个选项 第一，它可能有用
另一个选择是使用。一旦有了索引，就可以使用string.substring。如果将整个文件读入一个字符串，则有两个选项 第一，它可能有用
另一个选择是使用。一旦有了索引，就可以使用string.substring，您必须根据分隔符拆分行。在您的例子中，似乎使用了空格作为分隔符 您正在寻找的方法是String.Split（），它应该满足您的需要：）文档位于-它还包括示例 我会这样做：
string myLineOfText = "MyCompany 12345 The description of my company";
string[] partsOfMyLine = myLineOfText.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries);
// should be from a file but this is just an example
string[] lines = {
"00XXXXXXXXXX01YYYYYYYYYY02XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXXX",
"00XXXXXXXXXX01YYYYYYYYYY02XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXXX01YYYYYYYYYY02XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXXX",
"00XXXXXXXXXX01YYYYYYYYYY02XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXXX",
"00XXXXXXXXXX01YYYYYYYYYY02XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXXX",
"00XXXXXXXXXX01YYYYYYYYYY02XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXXX",
};
// loop through each line
// (lines can have multiple items)
foreach (string line in lines)
{
Client client = Parser.ParseData (line);
Console.WriteLine ("Read: " + client.name);
}
祝你好运！：） 必须根据分隔符拆分行。在您的例子中，似乎使用了空格作为分隔符 您正在寻找的方法是String.Split（），它应该满足您的需要：）文档位于-它还包括示例 我会这样做：
string myLineOfText = "MyCompany 12345 The description of my company";
string[] partsOfMyLine = myLineOfText.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries);
// should be from a file but this is just an example
string[] lines = {
"00XXXXXXXXXX01YYYYYYYYYY02XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXXX",
"00XXXXXXXXXX01YYYYYYYYYY02XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXXX01YYYYYYYYYY02XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXXX",
"00XXXXXXXXXX01YYYYYYYYYY02XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXXX",
"00XXXXXXXXXX01YYYYYYYYYY02XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXXX",
"00XXXXXXXXXX01YYYYYYYYYY02XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXX.XXXXXXXXXX",
};
// loop through each line
// (lines can have multiple items)
foreach (string line in lines)
{
Client client = Parser.ParseData (line);
Console.WriteLine ("Read: " + client.name);
}
祝你好运！：） 假设指定了固定的宽度，让我们创建两个简单的类来保存客户机及其相关数据作为列表：
// can hold as many items (data) as there are in the line
public class Client
{
public string name;
public List<ClientData> data;
};
// one single item in the client data
public class ClientData
{
public string code;
public string description;
};
假设指定了固定宽度，让我们创建两个简单类，以将客户机及其相关数据作为列表保存：
// can hold as many items (data) as there are in the line
public class Client
{
public string name;
public List<ClientData> data;
};
// one single item in the client data
public class ClientData
{
public string code;
public string description;
};
此解决方案假定数据是固定宽度的，并且项目编号将在描述之前（01在02之前）。此解决方案将在每次遇到描述记录时发出一条记录，并处理同一公司的多个产品 首先，定义一个类来保存数据：
public class Record
{
public string CompanyName { get; set; }
public string ItemNumber { get; set; }
public string Description { get; set; }
}
public static IEnumerable<Record> ReadFile(string input)
{
// Alter these as appropriate
const int RECORDTYPELENGTH = 2;
const int COMPANYNAMELENGTH = 41;
const int ITEMNUMBERLENGTH = 8;
const int DESCRIPTIONLENGTH = 48;
int index = 0;
string companyName = null;
string itemNumber = null;
while (index < input.Length)
{
string recordType = input.Substring(index, RECORDTYPELENGTH);
index += RECORDTYPELENGTH;
if (recordType == "00")
{
companyName = input.Substring(index, COMPANYNAMELENGTH).Trim();
index += COMPANYNAMELENGTH;
}
else if (recordType == "01")
{
itemNumber = input.Substring(index, ITEMNUMBERLENGTH).Trim();
index += ITEMNUMBERLENGTH;
}
else if (recordType == "02")
{
string description = input.Substring(index, DESCRIPTIONLENGTH).Trim();
index += DESCRIPTIONLENGTH;
yield return new Record
{
CompanyName = companyName,
ItemNumber = itemNumber,
Description = description
};
}
else
{
throw new FormatException("Unexpected record type " + recordType);
}
}
}
此解决方案假定数据是固定宽度的，并且项目编号将在描述之前（01在02之前）。此解决方案将在每次遇到描述记录时发出一条记录，并处理同一公司的多个产品 首先，定义一个类来保存数据：
public class Record
{
public string CompanyName { get; set; }
public string ItemNumber { get; set; }
public string Description { get; set; }
}
public static IEnumerable<Record> ReadFile(string input)
{
// Alter these as appropriate
const int RECORDTYPELENGTH = 2;
const int COMPANYNAMELENGTH = 41;
const int ITEMNUMBERLENGTH = 8;
const int DESCRIPTIONLENGTH = 48;
int index = 0;
string companyName = null;
string itemNumber = null;
while (index < input.Length)
{
string recordType = input.Substring(index, RECORDTYPELENGTH);
index += RECORDTYPELENGTH;
if (recordType == "00")
{
companyName = input.Substring(index, COMPANYNAMELENGTH).Trim();
index += COMPANYNAMELENGTH;
}
else if (recordType == "01")
{
itemNumber = input.Substring(index, ITEMNUMBERLENGTH).Trim();
index += ITEMNUMBERLENGTH;
}
else if (recordType == "02")
{
string description = input.Substring(index, DESCRIPTIONLENGTH).Trim();
index += DESCRIPTIONLENGTH;
yield return new Record
{
CompanyName = companyName,
ItemNumber = itemNumber,
Description = description
};
}
else
{
throw new FormatException("Unexpected record type " + recordType);
}
}
}
Sample.txt的内容00Company1 0115522 02This is a description for company 1. 00Company2 0115523 02This is a description for company 2. 00Company3 0115524 02This is a description for company 3
100012fieldlengthString directory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
String file = "Sample.txt";
String path = Path.Combine(directory, file);
Int32[] fieldLengths = new Int32[] { 12, 12, 52 };
List<RowData> rows = new List<RowData>();
Byte[] buffer = new Byte[fieldLengths.Sum()];
using (var stream = File.OpenRead(path))
{
while (stream.Read(buffer, 0, buffer.Length) > 0)
{
List<String> fieldValues = new List<String>();
Int32 offset = 0;
for (int i = 0; i < fieldLengths.Length; i++)
{
var value = Encoding.UTF8.GetString(buffer, offset, fieldLengths[i]);
fieldValues.Add(value);
offset += fieldLengths[i];
}
String companyName = fieldValues[0];
String itemNumber = fieldValues[1];
String description = fieldValues[2];
var row = new RowData(companyName, itemNumber, description);
rows.Add(row);
}
}
结果将出现在
行00Company1 0115522 02This is a description for company 1. 00Company2 0115523 02This is a description for company 2. 00Company3 0115524 02This is a description for company 3
100012fieldlengthString directory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
String file = "Sample.txt";
String path = Path.Combine(directory, file);
Int32[] fieldLengths = new Int32[] { 12, 12, 52 };
List<RowData> rows = new List<RowData>();
Byte[] buffer = new Byte[fieldLengths.Sum()];
using (var stream = File.OpenRead(path))
{
while (stream.Read(buffer, 0, buffer.Length) > 0)
{
List<String> fieldValues = new List<String>();
Int32 offset = 0;
for (int i = 0; i < fieldLengths.Length; i++)
{
var value = Encoding.UTF8.GetString(buffer, offset, fieldLengths[i]);
fieldValues.Add(value);
offset += fieldLengths[i];
}
String companyName = fieldValues[0];
String itemNumber = fieldValues[1];
String description = fieldValues[2];
var row = new RowData(companyName, itemNumber, description);
rows.Add(row);
}
}
结果将出现在
行中.substring（）substring（）.substring（）substring（）