C# 如何从文本文件中删除最后一列
我想从我的文本文件中删除最后一列。我怎样才能做到这一点。 我的文本文件是以制表符分隔的 输入文本文件如下所示:C# 如何从文本文件中删除最后一列,c#,string,visual-studio-2010,text,text-files,C#,String,Visual Studio 2010,Text,Text Files,我想从我的文本文件中删除最后一列。我怎样才能做到这一点。 我的文本文件是以制表符分隔的 输入文本文件如下所示: Designator MAX PN Footprint Center-X(mm) Center-Y(mm) Location "C10" "100-0009" "1206 - CAPACITOR" "122.492" "69.469" "BOTTOM" "DOC1" "100-0009" "1206 - CAPAC
Designator MAX PN Footprint Center-X(mm) Center-Y(mm) Location
"C10" "100-0009" "1206 - CAPACITOR" "122.492" "69.469" "BOTTOM"
"DOC1" "100-0009" "1206 - CAPACITOR" "264.211" "12.814" "BOTTOM"
"C102" "100-0009" "1206 - CAPACITOR" "251.346" "11.201" "BOTTOM"
"C105" "100-0009" "1206 - CAPACITOR" "0" "0" "BOTTOM"
"PCB" "100-0009" "1206 - CAPACITOR" "306.197" "29.909" "BOTTOM"
"C107" "100-0009" "1206 - CAPACITOR" "273.685" "29.527" "BOTTOM"
我想从文本文件中删除名为Location的整个列。。并处理输出
代码段:
public void do_name()
{
string[] search_text = new string[] { "PCB", "DOC", "PCB1", "DOC1" };
string old;
StringBuilder sb = new StringBuilder();
using (StreamReader sr = File.OpenText(textBox1.Text))
{
while ((old = sr.ReadLine()) != null)
{
if (old.Contains(search_text[0]) || old.Contains(search_text[1]) ||
old.Contains(search_text[2]) || old.Contains(search_text[3]) ||
old.Split('\t').Contains(@"""0"""))
continue;
else
sb.AppendLine(old);
}
sr.Close();
}
File.WriteAllText(textBox1.Text, sb.ToString());
}
一行包含6列,因此
old.Split('\t')
返回6个字符串的数组(如果输入格式一致)
在循环中,您可以选择前5个元素并将阵列粘合在一起:
string new = string.Join("\t", old.Split('\t').Take(5));
一行包含6列,因此
old.Split('\t')
返回6个字符串的数组(如果输入格式一致)
在循环中,您可以选择前5个元素并将阵列粘合在一起:
string new = string.Join("\t", old.Split('\t').Take(5));
一行包含6列,因此
old.Split('\t')
返回6个字符串的数组(如果输入格式一致)
在循环中,您可以选择前5个元素并将阵列粘合在一起:
string new = string.Join("\t", old.Split('\t').Take(5));
一行包含6列,因此
old.Split('\t')
返回6个字符串的数组(如果输入格式一致)
在循环中,您可以选择前5个元素并将阵列粘合在一起:
string new = string.Join("\t", old.Split('\t').Take(5));
这将完成以下工作:
string[] lines = File.ReadAllLines(@"c:\test.txt");
string[] newLines = lines.Select(l =>
{
if (!string.IsNullOrEmpty(l)) // keep the empty rows
{
return l.Remove(l.LastIndexOf(' ')).TrimEnd();
}
return l;
}).ToArray();
File.WriteAllLines(@"c:\newtest.txt", newLines);
这将完成以下工作:
string[] lines = File.ReadAllLines(@"c:\test.txt");
string[] newLines = lines.Select(l =>
{
if (!string.IsNullOrEmpty(l)) // keep the empty rows
{
return l.Remove(l.LastIndexOf(' ')).TrimEnd();
}
return l;
}).ToArray();
File.WriteAllLines(@"c:\newtest.txt", newLines);
这将完成以下工作:
string[] lines = File.ReadAllLines(@"c:\test.txt");
string[] newLines = lines.Select(l =>
{
if (!string.IsNullOrEmpty(l)) // keep the empty rows
{
return l.Remove(l.LastIndexOf(' ')).TrimEnd();
}
return l;
}).ToArray();
File.WriteAllLines(@"c:\newtest.txt", newLines);
这将完成以下工作:
string[] lines = File.ReadAllLines(@"c:\test.txt");
string[] newLines = lines.Select(l =>
{
if (!string.IsNullOrEmpty(l)) // keep the empty rows
{
return l.Remove(l.LastIndexOf(' ')).TrimEnd();
}
return l;
}).ToArray();
File.WriteAllLines(@"c:\newtest.txt", newLines);
只需在处理之前删除行中的最后一列
public void do_name()
{
bool headerRead = false;
bool layerColumnPresent = false;
string[] search_text = new string[] { "PCB", "DOC", "PCB1", "DOC1" };
string old;
StringBuilder sb = new StringBuilder();
using (StreamReader sr = File.OpenText(textBox1.Text))
{
while ((old = sr.ReadLine()) != null)
{
if (!headerRead)
{
layerColumnPresent = old.Substring(old.LastIndexOf("\t").ToLower()).Contains("layer")
headerRead = true;
}
if (old.Length > 0 && layColumnPresent) // if not a zero length string
{
old = old.Substring(0, old.LastIndexOf("\t"));
}
if (old.Contains(search_text[0]) || old.Contains(search_text[1]) ||
old.Contains(search_text[2]) || old.Contains(search_text[3]) ||
old.Split('\t').Contains(@"""0"""))
continue;
else
sb.AppendLine(old);
}
sr.Close();
}
File.WriteAllText(textBox1.Text, sb.ToString());
}
只需在处理之前删除行中的最后一列
public void do_name()
{
bool headerRead = false;
bool layerColumnPresent = false;
string[] search_text = new string[] { "PCB", "DOC", "PCB1", "DOC1" };
string old;
StringBuilder sb = new StringBuilder();
using (StreamReader sr = File.OpenText(textBox1.Text))
{
while ((old = sr.ReadLine()) != null)
{
if (!headerRead)
{
layerColumnPresent = old.Substring(old.LastIndexOf("\t").ToLower()).Contains("layer")
headerRead = true;
}
if (old.Length > 0 && layColumnPresent) // if not a zero length string
{
old = old.Substring(0, old.LastIndexOf("\t"));
}
if (old.Contains(search_text[0]) || old.Contains(search_text[1]) ||
old.Contains(search_text[2]) || old.Contains(search_text[3]) ||
old.Split('\t').Contains(@"""0"""))
continue;
else
sb.AppendLine(old);
}
sr.Close();
}
File.WriteAllText(textBox1.Text, sb.ToString());
}
只需在处理之前删除行中的最后一列
public void do_name()
{
bool headerRead = false;
bool layerColumnPresent = false;
string[] search_text = new string[] { "PCB", "DOC", "PCB1", "DOC1" };
string old;
StringBuilder sb = new StringBuilder();
using (StreamReader sr = File.OpenText(textBox1.Text))
{
while ((old = sr.ReadLine()) != null)
{
if (!headerRead)
{
layerColumnPresent = old.Substring(old.LastIndexOf("\t").ToLower()).Contains("layer")
headerRead = true;
}
if (old.Length > 0 && layColumnPresent) // if not a zero length string
{
old = old.Substring(0, old.LastIndexOf("\t"));
}
if (old.Contains(search_text[0]) || old.Contains(search_text[1]) ||
old.Contains(search_text[2]) || old.Contains(search_text[3]) ||
old.Split('\t').Contains(@"""0"""))
continue;
else
sb.AppendLine(old);
}
sr.Close();
}
File.WriteAllText(textBox1.Text, sb.ToString());
}
只需在处理之前删除行中的最后一列
public void do_name()
{
bool headerRead = false;
bool layerColumnPresent = false;
string[] search_text = new string[] { "PCB", "DOC", "PCB1", "DOC1" };
string old;
StringBuilder sb = new StringBuilder();
using (StreamReader sr = File.OpenText(textBox1.Text))
{
while ((old = sr.ReadLine()) != null)
{
if (!headerRead)
{
layerColumnPresent = old.Substring(old.LastIndexOf("\t").ToLower()).Contains("layer")
headerRead = true;
}
if (old.Length > 0 && layColumnPresent) // if not a zero length string
{
old = old.Substring(0, old.LastIndexOf("\t"));
}
if (old.Contains(search_text[0]) || old.Contains(search_text[1]) ||
old.Contains(search_text[2]) || old.Contains(search_text[3]) ||
old.Split('\t').Contains(@"""0"""))
continue;
else
sb.AppendLine(old);
}
sr.Close();
}
File.WriteAllText(textBox1.Text, sb.ToString());
}
var query=File.ReadLines(文件名)
.Where(line=>!search_text.Any(text=>line.Contains(text))//String.Join(“\t”,line.Split('\t')。Take(5));
writeAllines(newfilename,query);
编辑
Func<string, string> trim = s => s.Trim('“','”', '"', ' ' );
var query = File.ReadLines(filename)
.Select(line => line.Split('\t'))
.Where(parts => !parts.Any(part => search_text.Contains(trim(part))))
.Where(parts => !parts.Any(part => trim(part) == "0"))
.Select(parts => String.Join("\t", parts.Take(5)));
Func trim=s=>s.trim(“,”,“,”,“,”);
var query=File.ReadLines(文件名)
.Select(line=>line.Split('\t'))
.Where(parts=>!parts.Any(part=>search_text.Contains(trim(part)))
.其中(零件=>!零件.Any(零件=>修剪(零件)=“0”))
.Select(parts=>String.Join(“\t”,parts.Take(5)));
var query=File.ReadLines(文件名)
.Where(line=>!search_text.Any(text=>line.Contains(text))//String.Join(“\t”,line.Split('\t')。Take(5));
writeAllines(newfilename,query);
编辑
Func<string, string> trim = s => s.Trim('“','”', '"', ' ' );
var query = File.ReadLines(filename)
.Select(line => line.Split('\t'))
.Where(parts => !parts.Any(part => search_text.Contains(trim(part))))
.Where(parts => !parts.Any(part => trim(part) == "0"))
.Select(parts => String.Join("\t", parts.Take(5)));
Func trim=s=>s.trim(“,”,“,”,“,”);
var query=File.ReadLines(文件名)
.Select(line=>line.Split('\t'))
.Where(parts=>!parts.Any(part=>search_text.Contains(trim(part)))
.其中(零件=>!零件.Any(零件=>修剪(零件)=“0”))
.Select(parts=>String.Join(“\t”,parts.Take(5)));
var query=File.ReadLines(文件名)
.Where(line=>!search_text.Any(text=>line.Contains(text))//String.Join(“\t”,line.Split('\t')。Take(5));
writeAllines(newfilename,query);
编辑
Func<string, string> trim = s => s.Trim('“','”', '"', ' ' );
var query = File.ReadLines(filename)
.Select(line => line.Split('\t'))
.Where(parts => !parts.Any(part => search_text.Contains(trim(part))))
.Where(parts => !parts.Any(part => trim(part) == "0"))
.Select(parts => String.Join("\t", parts.Take(5)));
Func trim=s=>s.trim(“,”,“,”,“,”);
var query=File.ReadLines(文件名)
.Select(line=>line.Split('\t'))
.Where(parts=>!parts.Any(part=>search_text.Contains(trim(part)))
.其中(零件=>!零件.Any(零件=>修剪(零件)=“0”))
.Select(parts=>String.Join(“\t”,parts.Take(5)));
var query=File.ReadLines(文件名)
.Where(line=>!search_text.Any(text=>line.Contains(text))//String.Join(“\t”,line.Split('\t')。Take(5));
writeAllines(newfilename,query);
编辑
Func<string, string> trim = s => s.Trim('“','”', '"', ' ' );
var query = File.ReadLines(filename)
.Select(line => line.Split('\t'))
.Where(parts => !parts.Any(part => search_text.Contains(trim(part))))
.Where(parts => !parts.Any(part => trim(part) == "0"))
.Select(parts => String.Join("\t", parts.Take(5)));
Func trim=s=>s.trim(“,”,“,”,“,”);
var query=File.ReadLines(文件名)
.Select(line=>line.Split('\t'))
.Where(parts=>!parts.Any(part=>search_text.Contains(trim(part)))
.其中(零件=>!零件.Any(零件=>修剪(零件)=“0”))
.Select(parts=>String.Join(“\t”,parts.Take(5)));
@D Stanley有什么想法吗!!!请提前感谢@有什么想法吗!!!请提前感谢@有什么想法吗!!!请提前感谢@有什么想法吗!!!请提前感谢!!!我的行没有固定。。有时可能高达657。。。总有一天会达到700。。或者40岁的某个时候。。这是有变化的这起作用了。。但在我的循环中,它给出了一个错误。。请用我的完整答案更新你的代码。。THNAKSS应删除突出显示的。。线。。以编程方式paste.org/9721557#13,17,25my行不固定。。有时可能高达657。。。总有一天会达到700。。或者40岁的某个时候。。这是有变化的这起作用了。。但在我的循环中,它给出了一个错误。。请用我的完整答案更新你的代码。。THNAKSS应删除突出显示的。。线。。以编程方式paste.org/9721557#13,17,25my行不固定。。有时可能高达657。。。总有一天会达到700。。或者40岁的某个时候。。这是有变化的这起作用了。。但在我的循环中,它给出了一个错误。。请用我的完整答案更新你的代码。。THNAKSS应删除突出显示的。。线。。以编程方式paste.org/9721557#13,17,25my行不固定。。有时可能高达657。。。总有一天会达到700。。或者40岁的某个时候。。这是有变化的这起作用了。。但在我的循环中,它给出了一个错误。。请用我的完整答案更新你的代码。。THNAKSS应删除突出显示的。。线。。以编程方式Paste.org/9721557#13,17,25我确信OP希望将此合并到他的现有代码中,因此读写文件两次似乎有点过火。@L.B.现有代码已经使用streamreader读取文件以排除某些行。这个答案似乎是OP使用的建议,对吗?当OP将此代码添加到其现有代码中时,File.ReadLines
和StreamReader
都将读取该文件。这是不必要的,可以做一次。事实上,例如通过将OP的if
转换为Where
上的ReadLines()<