truncate | 易学教程

How do I truncate a list in C#?

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问题 I know in python you can do something like myList[1:20] but is there anything similar in C#? 回答1: var itemsOneThroughTwenty = myList.Take(20); var itemsFiveThroughTwenty = myList.Skip(5).Take(15); 回答2: You can use List<T>.GetRange(): var subList = myList.GetRange(0, 20); From MSDN: Creates a shallow copy of a range of elements in the source List<T> . public List<T> GetRange(int index, int count) 回答3: This might be helpful for efficiency, if you really want to truncate the list, not make a

Rails truncate helper with link as omit text

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问题 I'm quite long description that I want to truncate using truncate helper. So i'm using the: truncate article.description, :length => 200, :omission => ' ...' The problem is that I want to use more as a clickable link so in theory I could use this: truncate article.description, :length => 200, :omission => "... #{link_to('[more]', articles_path(article)}" Omission text is handled as unsafe so it's escaped. I tried to make it html_safe but it didn't work, instead of link [more] my browser is

Truncate table(s) with rails console

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问题 I have this testingdatabase which, by now, is stuffed with junk. Now I've done a few Table.destroy_all commands in the rails console which deletes all records and dependencies which is awesome. However; I'd like to truncate everything so the ID's etc. start at 1 again. Is there any way in Rails 3? 回答1: The accepted answer only works if you need to recreate the whole database. To drop a single table (with the callbacks) and to get the IDs to start from 1: Model.destroy_all # Only necessary if

How can I perfectly truncate a string in c?

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问题 I am reading from a file of which each line is longer than 63 characters and I want the characters to be truncated at 63. However, it fails to truncate the lines read from the file. In this program we are assuming that the file has 10 lines only: #include <stdio.h> #include <stdlib.h> int main(void) { char a[10][63]; char line[255]; int count = 0; //Open file FILE *fp; fp = fopen("lines.dat", "r"); //Read each line from file to the "line array" while(fgets(line, 255,fp) != NULL) { line[63] =

character count minus HTML characters C#

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问题 I'm trying to figure out a way to count the number of characters in a string, truncate the string, then returns it. However, I need this function to NOT count HTML tags. The problem is that if it counts HTML tags, then if the truncate point is in the middle of a tag, then the page will appear broken. This is what I have so far... public string Truncate(string input, int characterLimit, string currID) { string output = input; // Check if the string is longer than the allowed amount //

GWT - DoubleBox with more than 3 decimal places

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问题 I'm creating an user interface using GWT and there're many boxes of double values but when I set some variable which contains more than 3 decimal places my DoubleBox doesn't accept and truncates the number letting just 3 places. Is it normal? What's the best solution? Thank you. 回答1: As the javadoc says DoubleBox is a ValueBox using a DoubleParser and DoubleRenderer . Those rely on NumberFormat.getDecimalFormat() which will trunk at 3 decimals in most (if not all) locales (for the default

clear/truncate file in C when already open in “r+” mode

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问题 My code currently looks something like this (these steps splitted into multiple functions): /* open file */ FILE *file = fopen(filename, "r+"); if(!file) { /* read the file */ /* modify the data */ /* truncate file (how does this work?)*/ /* write new data into file */ /* close file */ fclose(file); } I know I could open the file with in "w" mode, but I don't want to do this in this case. I know there is a function ftruncate in unistd.h / sys/types.h , but I don't want to use these functions

html truncator in java

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问题 Is there any utility (or sample source code) that truncates HTML (for preview) in Java? I want to do the truncation on the server and not on the client. I'm using HTMLUnit to parse HTML. UPDATE: I want to be able to preview the HTML, so the truncator would maintain the HTML structure while stripping out the elements after the desired output length. 回答1: I think you're going to need to write your own XML parser to accomplish this. Pull out the body node, add nodes until binary length < some

详解Oracle DELETE和TRUNCATE 的区别

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 语法 delete from aa truncate table aa 区别 1.delete from后面可以写条件，truncate不可以。 2.delete from记录是一条条删的，所删除的每行记录都会进日志，而truncate一次性删掉整个页，因此日至里面只记录页释放，简言之，delete from更新日志，truncate基本不，所用的事务日志空间较少。 3.delete from删空表后，会保留一个空的页，truncate在表中不会留有任何页。 4.当使用行锁执行 DELETE 语句时，将锁定表中各行以便删除。truncate始终锁定表和页，而不是锁定各行。 5.如果有identity产生的自增id列，delete from后仍然从上次的数开始增加，即种子不变，而truncate后，种子会恢复初始。 6.truncate不会触发delete的触发器，因为truncate操作不记录各个行删除。总结 1.truncate和 delete只删除数据不删除表的结构(定义) drop语句将删除表的结构被依赖的约束(constrain),触发器(trigger),索引(index); 依赖于该表的存储过程/函数将保留,但是变为invalid状态。 2.delete语句是dml,这个操作会放到rollback

Truncate part of an NSString starting at a particular character

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问题 I have a string NSString * myOldString = @"This is a string (and this part is between brackets)" Now, I want to truncate the string in such a way, that basically everything between the brackets, including the brackets, is truncated. More precisely: I don't care what is happening after the first bracket at all. I can't do a simple stringByReplacingOccurrencesOfString: , because I cannot predict what will be between the brackets. So, the resulting string should be: "This is a string" 回答1: One