compare

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: How would I go about writing a custom ValidationAttribute that compares two fields? This is the common "enter password", "confirm password" scenario. I need to be sure the two fields are equal and to keep things consistent, I want to implement the validation via DataAnnotations. So in pseudo-code, I'm looking for a way to implement something like the following: public class SignUpModel { [ Required ] [ Display ( Name = "Password" )] public string Password { get ; set ; } [ Required ] [ Display ( Name = "Re-type Password" )] [

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I am trying to achieve a dropBox sync and need to compare the dates of two files. One is on my dropBox account and one is on my iPhone. I came up with the following, but I get unexpected results. I guess I'm doing something fundamentally wrong when comparing the two dates. I simply used the > < operators, but I guess this is no good as I am comparing two NSDate strings. Here we go: NSLog (@ "dB...lastModified: %@" , dbObject . lastModifiedDate ); NSLog (@ "iP...lastModified: %@" , [ self getDateOfLocalFile :@ "NoteBook.txt" ]); if

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I've been using the == operator in my program to compare all my strings so far. However, I ran into a bug, changed one of them into .equals() instead, and it fixed the bug. Is == bad? When should it and should it not be used? What's the difference? 回答1: == tests for reference equality (whether they are the same object). .equals() tests for value equality (whether they are logically "equal"). Objects.equals() checks for nulls before calling .equals() so you don't have to (available as of JDK7, also available in Guava ). Consequently, if you

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Comparing string in C# is pretty simple. In fact there are several ways to do it. I have listed some in the block below. What I am curious about are the differences between them and when one should be used over the others? Should one be avoided at all costs? Are there more I haven't listed? string testString = "Test"; string anotherString = "Another"; if (testString.CompareTo(anotherString) == 0) {} if (testString.Equals(anotherString)) {} if (testString == anotherString) {} (Note: I am looking for equality in this example, not less than or

I'm having trouble with what I thought should be a pretty simple problem. I need to compare every item in an arrayList with every other item in the the list without comparing items to themselves. It's not as simple as calling an equals() comparison, it involves some custom logic that I've omitted from my code below. Also the ArrayList should not be changed in any way. The problem I seem to be having is that once I get into the second loop, I don't know if I have another object to compare to (since its a variable sized list). for(int i =0; i< list.size(); i++){ //get first object to compare to

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: My requirement is comparing String to ArrayList which contains a list of strings. Can any one suggest me? 回答1: Use ArrayList . contains ( "StringToBeChecked" ); If the String is present in the ArrayList, this function will return true, else will return false. 回答2: Look at the List#contains(T obj) method, like this: List list = new ArrayList (); list . add ( "abc" ); list . add ( "xyz" ); list . contains ( "abc" ); // true list . contains ( "foo" ); // false 回答3: This is your method: private boolean containsString ( String

I have a problem, I need to compare two inputstreams fast. Today I have a function like this: private boolean isEqual(InputStream i1, InputStream i2) throws IOException { try { // do the compare while (true) { int fr = i1.read(); int tr = i2.read(); if (fr != tr) return false; if (fr == -1) return true; } } finally { if (i1 != null) i1.close(); if (i2 != null) i2.close(); } } But it's really slow. I want to use buffered reads but have not come up with a good way of doing it. Some extra stuff that makes it harder: I don't want to read one of the input streams into memory (the whole one) I don't

compare 函数 s.compare函数的几种参数形式 s.compare(s2)//比较s和s2; s.compare(pos1,n1,s2)//将s中从s1开始的n1个字符与s2进行比较 s.compare(pos1,n1,s2,pos2,n2)//将s中从pos1开始的n1个字符和s2中从pos2 开始的n2个字符进行比较。 s.compare(cp)//比较s和cp 指向的地址开始以空字符结尾的字符数组 s.compare(pos1,n1,cp)//将s中pos1开始的n1个字符和cp 指向的地址开始以空字符结尾的字符数组进行比较 s.compare(pos1,n1,cp,n2)//将s中以pos1开始的n1个字符和cp指向的地址开始以空字符结尾的字符数组中n2个字符进行比较 数值转换 string 和数值之间的转换 to_string(val)//返回val 的string 表示。val可以是任何算术类型。对每个浮点类型和int 类型都有相应的to_string版本，小整型会被提升 stoi(s,p,b); stol(s,p,b); stoul(s,p,b); stoll(s,p,b); stoull(s,p,b); //返回s的起始子串的数值，返回类型分别是 int,long,unsigned long,long long,unsigned long long; b