Arraylist.remove问题？请帮忙。 [英] Arraylist.remove problem?? Please help.

问题描述

只要arraylist是>我就有一个设置为运行的循环。 0.
在这个循环开始的
我抓住第一个对象然后

删除它。然后我进入另一个循环，检查是否有更多的对象与我抓住的第一个对象匹配。如果

匹配，那么我把它们放在一个数组中。我想从arraylist中删除每个

的比赛，因为我发现它们可以加快速度，所以

他们不会再次检查。如果我试着这样做，那么似乎要把一切搞得一团糟。请有人帮助我。它们也不是我正在做的完全匹配...它们是对象，我做了一个正则表达式

我抓住的第一个对象然后检查每个对象看看它是否b



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I have a loop that is set to run as long as the arraylist is > 0.
at the beginning of this loop I grab the first object and then
remove it. I then go into another loop that checks to see if there
are more objects that match the first object that i grabbed. If
they match then I put them in an array. I would like to remove each
match from the arraylist as I find them to speed things up and so
that they don''t get checked again. If I try to do that it seems to
mess everything up. Please can someone help me. Also they are not
exact matches that I am doing...they are objects and I do a regex on
the first object that i grab and then check each one to see if it
contains the new regexed value in a varaible of each object.
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推荐答案

Ex*******@extremest.com 写道：

只要arraylist是>我就有一个设置为运行的循环。在这个循环开始时我抓住了第一个对象，然后将其删除。然后我进入另一个循环，检查是否有更多的对象与我抓住的第一个对象相匹配。如果它们匹配，那么我把它们放在一个数组中。我想从arraylist中删除每个
匹配，因为我发现它们可以加快速度，所以
它们不会再被检查。如果我试着这样做，似乎把一切搞得一团糟。请有人帮助我。它们也不是我正在做的完全匹配......它们是对象，我做了一个正则表达式，我抓住的第一个对象，然后检查每个对象，看它是否包含
每个对象的变量中新的正则表达式值。
-

I have a loop that is set to run as long as the arraylist is > 0.
at the beginning of this loop I grab the first object and then
remove it. I then go into another loop that checks to see if there
are more objects that match the first object that i grabbed. If
they match then I put them in an array. I would like to remove each
match from the arraylist as I find them to speed things up and so
that they don''t get checked again. If I try to do that it seems to
mess everything up. Please can someone help me. Also they are not
exact matches that I am doing...they are objects and I do a regex on
the first object that i grab and then check each one to see if it
contains the new regexed value in a varaible of each object.
--

这听起来像是一个相当小的代码片段。

你能把它解压成一个小的，独立的程序吗？

演示问题，然后在这里发布整个东西，这样我们就可以粘贴
了它进入VS并为自己尝试了吗？

It sounds like a fairly small stretch of code that is the problem.
Could you extract it into a small, stand-alone program that
demonstrates the problem and then post the whole thing here, so that we
can paste it into VS and try it for ourselves?

确定我是c＃的新手，所以请放轻松对待我....大声笑..

这里是整个前卫。它是一个控制台应用程序，所以不是很大...只有

今天写了它所以它仍然相当草率...如果有更好的

的做法其中任何内容请告诉我。

使用系统;

使用System.Collections;

使用System.Text;

使用MySql.Data;

使用System.Text.RegularExpressions;


命名空间createfiles

{

class program

{

static MySql.Data.MySqlClient.MySqlConnection conn

= new MySql.Data.MySqlClient.MySqlConnection（ ）;

static MySql.Data.MySqlClient.MySqlCommand cmd =

new MySql.Data.MySqlClient.MySqlCommand（）;

静态字符串myConnectionString =" server =

127.0.0.1; uid = root; pwd = password; database = test;" ;;

static ArrayList master;

静态字符串组;

静态字符串表;

静态字符串[] groups = {

" alt.binaries.games.xbox" ;，alt.bi naries.games.xbox360"，

" alt.binaries.vcd" };

static Regex reg = new Regex（" \\。"）;

static Regex seg = new Regex（" \\（ [0-9] * / [0-9]。*

\\）"，RegexOptions.IgnoreCase）;

struct Header

{

公共字符串麻木;

公共字符串主题;

公共字符串日期;

公共字符串来自;

公共字符串msg_id;

公共字符串字节;

}


static void Main （string [] args）

{

for（int x = 2; x< groups.Length; x ++）

{

table = reg.Replace（groups [x]，""）;

group = groups [x];

getheaders（）;

Console.WriteLine（有这么多标题

{0}，master.Count）;

标题一=（标题） ）master [0];

Console.WriteLine（" first one {0} {1}"，

one.numb，one.subject）;

find（）;

master.Clear（）;

}


}
static void getheaders（）

{

conn.ConnectionString = myConnectionString;

conn.Open（）;

cmd.Connection = conn;

cmd.CommandText =" select * from" + table +"

其中主题如''％（％/％）％''按主题desc排序';

MySql.Data.MySqlClient.MySqlDataReader reader;

reader = cmd.ExecuteReader（）;

标题h =新标题（）;

master = new ArrayList（）;

while（reader.Read（））

{

h.numb = reader.GetValue（0）.ToString（）;

h.subject = reader.GetValue（1）.ToString（）;

h.from = reader.GetValue（2）.ToString（）;

h .date = reader.GetValue（3）.ToString（）;

h.msg_id = reader.GetValue（4）.ToString（）;

h.bytes = reader .GetValue（5）.ToString（）;

master.Add（h）;

}

reader.Close（）;

conn.Close（）;


}

static void find（）

{

int foundm = 0;

while（master.Count> 0）

{

Header start =（Header） master [0];

master.RemoveAt（0）;

匹配m = seg.Match（start.subject）;

string segsplit = m.ToString（）;

segsplit = segsplit.Replace（"（"，""）;

segsplit = segsplit.Replace（" ）"，""）;

string [] segments = segsplit.Split（''/''）;

int max = int.Parse（segments [1]）;

max + = 1;

int counter = 1;

Header [] found = new Header [max];

int index = int.Parse（segments [0]）;

int temp = master.Count;

if（index< max）

{

found [index] = start;

for（int x = 0; x< master.Count; x ++）

{

页眉测试=（页眉）大师[x];

字符串testsubject = seg.Replace

（start.subject，""）;

if（test.subject.Contains

（testsubject））

{

//master.Remove(test）;

匹配t = seg.Match

（test.subject）;

string tsplit = t.ToString（）;

string tsegsplit =

tsplit.Replace（"（"，""）;

tsgsplit = tsegsplit.Replace

（"）"，""）;

string [] tsegments =

tsegsplit .Split（''/''）;

index = int.Parse（tsegments

[0]）;

//控制台。 WriteLine（柜台）;

if（index< max）

{

found [index] = test;

counter ++;

}

}


}

//Console.WriteLine(" ; counter = {0}"，
counter）;

int testmax = max-1;

if（counter == testmax）

{

foundm ++;

for（int t = 1; t< found.Length;

t ++）

{

Console.WriteLine（" We have a

Match { 0}"，找到[t] .subject）;

}

}

}

} < br $>
}


}

}

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ok I am new to c# so take it easy on me....lol..
here is the whole prog. It is a console app so is not to big...only
wrote it today so it is still pretty sloppy...if there is a better
way of doing anything in it please let me know.
using System;
using System.Collections;
using System.Text;
using MySql.Data;
using System.Text.RegularExpressions;

namespace createfiles
{
class Program
{
static MySql.Data.MySqlClient.MySqlConnection conn
= new MySql.Data.MySqlClient.MySqlConnection();
static MySql.Data.MySqlClient.MySqlCommand cmd =
new MySql.Data.MySqlClient.MySqlCommand();
static string myConnectionString = "server=
127.0.0.1;uid=root;pwd=password;database=test;";
static ArrayList master;
static string group;
static string table;
static string[] groups = {
"alt.binaries.games.xbox", "alt.binaries.games.xbox360",
"alt.binaries.vcd" };
static Regex reg = new Regex("\\.");
static Regex seg = new Regex("\\([0-9]*/[0-9].*
\\)",RegexOptions.IgnoreCase);
struct Header
{
public string numb;
public string subject;
public string date;
public string from;
public string msg_id;
public string bytes;
}

static void Main(string[] args)
{
for (int x = 2; x < groups.Length; x++)
{
table = reg.Replace(groups[x], "");
group = groups[x];
getheaders();
Console.WriteLine("Have this many headers
{0}", master.Count);
Header one = (Header)master[0];
Console.WriteLine("first one {0} {1}",
one.numb, one.subject);
find();
master.Clear();
}

}
static void getheaders()
{
conn.ConnectionString = myConnectionString;
conn.Open();
cmd.Connection = conn;
cmd.CommandText = "select * from " + table + "
where subject like ''%(%/%)%'' order by subject desc";
MySql.Data.MySqlClient.MySqlDataReader reader;
reader = cmd.ExecuteReader();
Header h = new Header();
master = new ArrayList();
while (reader.Read())
{
h.numb = reader.GetValue(0).ToString();
h.subject = reader.GetValue(1).ToString();
h.from = reader.GetValue(2).ToString();
h.date = reader.GetValue(3).ToString();
h.msg_id = reader.GetValue(4).ToString();
h.bytes = reader.GetValue(5).ToString();
master.Add(h);
}
reader.Close();
conn.Close();

}
static void find()
{
int foundm = 0;
while (master.Count > 0)
{
Header start = (Header)master[0];
master.RemoveAt(0);
Match m = seg.Match(start.subject);
string segsplit = m.ToString();
segsplit = segsplit.Replace("(", "");
segsplit = segsplit.Replace(")", "");
string[] segments = segsplit.Split(''/'');
int max = int.Parse(segments[1]);
max += 1;
int counter = 1;
Header[] found = new Header[max];
int index = int.Parse(segments[0]);
int temp = master.Count;
if (index < max)
{
found[index] = start;
for (int x = 0; x < master.Count; x++)
{
Header test = (Header)master[x];
string testsubject = seg.Replace
(start.subject, "");
if (test.subject.Contains
(testsubject))
{
//master.Remove(test);
Match t = seg.Match
(test.subject);
string tsplit = t.ToString();
string tsegsplit =
tsplit.Replace("(", "");
tsegsplit = tsegsplit.Replace
(")", "");
string[] tsegments =
tsegsplit.Split(''/'');
index = int.Parse(tsegments
[0]);
//Console.WriteLine(counter);
if (index < max)
{
found[index] = test;
counter++;
}
}

}
//Console.WriteLine("counter = {0}",
counter);
int testmax = max-1;
if (counter == testmax)
{
foundm++;
for (int t = 1; t < found.Length;
t++)
{
Console.WriteLine("We Have a
Match {0}", found[t].subject);
}
}
}
}
}

}
}
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我看不出你的代码有什么特别的错误。 RemoveAt（0）

应该每次在主循环周围移除一个项目，因此数组

最终应该变空。


我建议在调试器下运行你的程序并观察

它的功能。很可能你很快就会看到这个错误。


不幸的是我无法测试它，因为我不是我安装了MySql。


我做了一些重新安排，以便更容易阅读/调试。警告：我

无法编译此代码，因为我没有MySql，所以我没有

保证它将编译/运行。我还将你的Header

结构改为了一个类。我认为使用struct没有任何优势。对于Header。

以下是重新排列的代码。


使用System;

使用System.Collections;

使用System.Text;

使用MySql.Data;

使用System.Text.RegularExpressions;

命名空间createfiles

{

class program

{

static string [] groups = {

" alt .binaries.games.xbox"，" alt.binaries.games.xbox360"，

" alt.binaries.vcd" };

静态正则表达式reg =新正则表达式（" \\。"）;

静态正则表达式seg =新

正则表达式（\\（[0-9] * / [0-9]。* \\）"，RegexOptions.IgnoreCase）;

类标题

{

公共字符串麻木;

公共字符串主题;

公共字符串日期;

公共字符串来自;

公共字符串msg_id;

公共字符串字节;

}

static void Main（string [] args）

{

for（int x = 2; x< groups.Length; x ++）

{

string table = reg.Replace（groups [x]，""）;

ArrayList master = getheaders（table）;

Console.WriteLine（"有这么多标题{0}"，master.Count）;

标题一=（标题）主[0];

Console.WriteLine（"第一个） {0} {1}"，one.numb，one.subject）;

find（master）;

}

}

静态ArrayList getheaders（字符串表）

{

MySql.Data.MySqlClient.MySqlConnection conn

= new MySql.Data.MySqlClient.MySqlConnection（）;

MySql .Data.MySqlClient.MySqlCommand cmd =

new MySql.Data.MySqlClient.MySqlCommand（）;

string myConnectionString =

" server = 127.0.0.1; uid = root; pwd = password; database = t est;" ;;

conn.ConnectionString = myConnectionString;

conn.Open（）;

cmd.Connection = conn;

cmd.CommandText =" select * from" + table +"主题如

''％（％/％）％''按主题desc排序" ;;

MySql.Data.MySqlClient.MySqlDataReader reader;

reader = cmd.ExecuteReader（）;

标题h =新标题（）;

ArrayList master = new ArrayList（）;

while（reader.Read（））

{

h.numb = reader.GetValue（0）.ToString（）;

h .subject = reader.GetValue（1）.ToString（）;

h.from = reader.GetValue（2）.ToString（）;

h.date = reader .GetValue（3）.ToString（）;

h.msg_id = reader.GetValue（4）.ToString（）;

h.bytes = reader.GetValue（5 ）.ToString（）;

master.Add（h）;

}

reader.Close（）;

conn.Close（）;

返回主服务器;

}

static void find（ArrayList master）

{

int foundm = 0;

while（master.Count> 0）

{

标题start =（Header）master [0];

master.RemoveAt（0）;

int index;

int max;

ExtractMessageNumber（start.subject，out index，out max）;

max + = 1;

int counter = 1;

Header [] found = new Header [max];

int temp = master.Count;

if（index< max）

{

found [index] = start;

string testsubject = ExtractMainSubject（start.subject）;

for（int x = 0; x< master.Count; x ++）

{

Header test =（Header）master [x];

if（test.subject.Contains（testsubject））

{

//master.Remove(test）;

int testIndex;

int testMax;

ExtractMessageNumber（test.subject，out testIndex，out testMax）;

//Console.WriteLine(counter） ;

if（testIndex< max）

{

found [testIndex] = test;

counter ++;

}

}

}

//Console.WriteLine("counter = {0}" ，柜台）;

int testmax = max-1;

if（counter == testmax）

{

foundm ++;

for（int t = 1; t< found.Length; t ++）

{

Console.WriteLine（"我们有一个匹配{0}"，找到[t] .subject）;

}

}

}

}

}


private void ExtractMessageNumber（string subject，out int number，out

int max）

{

匹配m = seg.Match（主题）;

string segsplit = m.ToString（）。替换（"（"，"） ;"）。替换（"）"，""）;

string [] segments = segsplit.Split（''/''）;

number = int.Parse（segments [0]）;

max = int.Parse（segments [1]）;

}


private string ExtractMainSubject（string subject）

{

返回seg.Replace（subject，""）;

}

}

}

I can''t see anything specifically wrong with your code. The RemoveAt(0)
should remove one item each time around the major loop, so the array
should eventually become empty.

I would recommend running your program under the debugger and watch
what it does. It is highly likely that you''ll see the mistake quite
quickly.

Unfortunately I can''t test it, as I don''t have MySql installed.

I did some rearrangement to make it easier to read / debug. Caveat: I
can''t compile this code because I don''t have MySql, so I make no
guarantees that it will compile / run. I also changed your Header
struct to a class. I see no advantage in using "struct" for Header.
Following is the rearranged code.

using System;
using System.Collections;
using System.Text;
using MySql.Data;
using System.Text.RegularExpressions;
namespace createfiles
{
class Program
{
static string[] groups = {
"alt.binaries.games.xbox", "alt.binaries.games.xbox360",
"alt.binaries.vcd" };
static Regex reg = new Regex("\\.");
static Regex seg = new
Regex("\\([0-9]*/[0-9].*\\)",RegexOptions.IgnoreCase);
class Header
{
public string numb;
public string subject;
public string date;
public string from;
public string msg_id;
public string bytes;
}
static void Main(string[] args)
{
for (int x = 2; x < groups.Length; x++)
{
string table = reg.Replace(groups[x], "");
ArrayList master = getheaders(table);
Console.WriteLine("Have this many headers {0}", master.Count);
Header one = (Header)master[0];
Console.WriteLine("first one {0} {1}", one.numb, one.subject);
find(master);
}
}
static ArrayList getheaders(string table)
{
MySql.Data.MySqlClient.MySqlConnection conn
= new MySql.Data.MySqlClient.MySqlConnection();
MySql.Data.MySqlClient.MySqlCommand cmd =
new MySql.Data.MySqlClient.MySqlCommand();
string myConnectionString =
"server=127.0.0.1;uid=root;pwd=password;database=t est;";
conn.ConnectionString = myConnectionString;
conn.Open();
cmd.Connection = conn;
cmd.CommandText = "select * from " + table + " where subject like
''%(%/%)%'' order by subject desc";
MySql.Data.MySqlClient.MySqlDataReader reader;
reader = cmd.ExecuteReader();
Header h = new Header();
ArrayList master = new ArrayList();
while (reader.Read())
{
h.numb = reader.GetValue(0).ToString();
h.subject = reader.GetValue(1).ToString();
h.from = reader.GetValue(2).ToString();
h.date = reader.GetValue(3).ToString();
h.msg_id = reader.GetValue(4).ToString();
h.bytes = reader.GetValue(5).ToString();
master.Add(h);
}
reader.Close();
conn.Close();
return master;
}
static void find(ArrayList master)
{
int foundm = 0;
while (master.Count > 0)
{
Header start = (Header)master[0];
master.RemoveAt(0);
int index;
int max;
ExtractMessageNumber(start.subject, out index, out max);
max += 1;
int counter = 1;
Header[] found = new Header[max];
int temp = master.Count;
if (index < max)
{
found[index] = start;
string testsubject = ExtractMainSubject(start.subject);
for (int x = 0; x < master.Count; x++)
{
Header test = (Header)master[x];
if (test.subject.Contains(testsubject))
{
//master.Remove(test);
int testIndex;
int testMax;
ExtractMessageNumber(test.subject, out testIndex, out testMax);
//Console.WriteLine(counter);
if (testIndex < max)
{
found[testIndex] = test;
counter++;
}
}
}
//Console.WriteLine("counter = {0}", counter);
int testmax = max-1;
if (counter == testmax)
{
foundm++;
for (int t = 1; t < found.Length; t++)
{
Console.WriteLine("We Have a Match {0}", found[t].subject);
}
}
}
}
}

private void ExtractMessageNumber(string subject, out int number, out
int max)
{
Match m = seg.Match(subject);
string segsplit = m.ToString().Replace("(", "").Replace(")", "");
string[] segments = segsplit.Split(''/'');
number = int.Parse(segments[0]);
max = int.Parse(segments[1]);
}

private string ExtractMainSubject(string subject)
{
return seg.Replace(subject, "");
}
}
}

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