tostring | 易学教程

ToString on Expression Trees produces badly formatted output

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问题 When I use Expression.ToString() to convert an Expression Tree into human readable form, the result is something like this: x => ((x.ID > 2) OrElse (x.ID != 6)) x => ((x.ID > 2) AndAlso (x.ID != 6)) Ideally, I would want the output to show the operators instead of "OrElse" and "AndAlso": x => ((x.ID > 2) || (x.ID != 6)) x => ((x.ID > 2) && (x.ID != 6)) As a workaround, I could use the string.Replace() method.. .Replace("AndAlso", "&&") .Replace("OrElse", "||") but that has obvious weaknesses

Change “ToString” for a sealed class

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问题 I have a class I am working with: public sealed class WorkItemType It's ToString is weak (Just shows Microsoft.TeamFoundation.WorkItemTracking.Client.WorkItemType ). Is there any way to override this to show the name of the WorkItemType ? Normally I would just aggregate the value in a new class, but I am using this for bindings in WPF (I want to have a list of WorkItemTypes in a combo box and assign the selected value to a bound WorkItemType variable.) I think I am out of luck here, but I

How does Integer.toString() works internally?

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问题 I found that a similar question has been asked before here : how does Float.toString() and Integer.toString() works? But this doesn't speak about how that function internally works. When I opened the internally source code of Integer.toString() , it is not understandable for normal junior java programmer. Can somebody please explain what happens internally in short description ? NOTE : This was one of the interview questions that I was asked recently. I had no idea about how to answer such

How to override the ToString method of ArrayList of object?

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问题 class Person { public String firstname; public String lastname; } Person p1 = new Person("Jim","Green"); Person p2 = new Person("Tony","White"); ArrayList<Person> people = new ArrayList<Person>(); people.add(p1); people.add(p2); System.out.println(people.toString()); I'd like the output to be [Jim,Tony] , what is the simplest way to override the ToString method if such a method exists at all? 回答1: You actually need to override toString() in your Person class, which will return the firstname,

Use ToString() with @Html.DisplayFor

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问题 Why can't I use ToString("#.##") with a @Html.DisplayFor such as: @Html.DisplayFor(modelItem => modelItem.Balance.ToString("#.##")) 回答1: when I've encountered this before, I simply added a Getter to the model that the View consumes. public string FormattedBalance { get { return this.Balance.ToString("#.##"); } } And then just use it in your view: @Html.DisplayFor(ModelItem => ModelItem.FormattedBalance) 回答2: The DisplayFor renders the default ToString method for the supplied model property.

QML - getting the code of a JS function as a string

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问题 It seems like it is possible to get the code of a function in JavaScript, and that it is as simple as: function foo() {...} foo.toString() However, doing that in QML gives me a rather uninspiring function () { [code] } So is there a way to get the [code] part as well? I also tried JSON.stringify() but it didn't do any good. 回答1: I'd like to sum up the discussion that took place in the comments, for this can be a good response for future searches. As already stated in the comments, it looks to

Printing an Arraylist in toString with lines separating each entry

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问题 I have a toString that needs to print a lot of stuff, including an Arraylist which contains multiple entries. Those entries have to be separated by a new line. Here is the toString code that I am working with right now: @Override public String toString() // Displays the info for a class { return getCourseId() + "\n" + getCourseName() + "\n" + getCourseCode() + "\n" + "\n" + "Instructor" + "\n" + "-------------------------" + "\n" + Instructor.toString() + "\n" + "\n" + "Student Roster" + "\n"

课程第六次作业

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课程第六次作业题目要求；本次作业要求将四则运算的核心部分采取栈的知识进行解决。即表达式生成的合法性检验、表达式结果计算。学习C++界面编程，可以学QT、MFC或者VS，选择其一即可，用博客记录学习到的知识以及心得体会。界面的不足之处：界面没有实现可以下一题的操作，没有锁定算式不能被操作，所以容易被误操作。使输出答案。学习链接 git链接界面展示：代码展示： void CMFCApplication2Dlg::OnBnClickedButton1() { UpdateData(); //expression ;窗口添加的变量 Problem p; tmp = p.generateExpression(); expression = tmp.c_str();//将string转变为Cstring UpdateData(false); } void CMFCApplication2Dlg::OnBnClickedButton2() { UpdateData(); Problem p; rightanswer = p.calculateResult(tmp);//tmp为全局变量实现题目的传入 if (answer == rightanswer)//answer为用户在界面输入的答案（窗口添加的变量），rightanswer为正确的答案 { correctnum++;/

Using StatePrinter from VB rather than C# to implement ToString

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问题 I'm trying to follow the promising suggestion posted here to try StatePrinter as a shortcut to rolling my own ToString methods. I agree with the OP that it is a shame that VS still can't generate this method for me. I've got a fairly large project, in VS2015 (Community Edition), with both VB and C# code. I added the current stable version of StatePrinter using NuGet. I can make the example code from the SO answer work fine in my C# code but when I do what I think is the equivalent in my VB

Qt Why use QString::number() over QLocale().toString()?

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问题 The application I am working on will be launched in many countries and needs to support their language. I've been going back through my code and replacing every instance of: QString::number() and QString().toDouble() with QLocale().toString() and QLocale().toDouble() I haven't found much online comparing the two classes, but I am interested in the repercussions of using the latter, and if there are none - why ever use the QString functions? Essentially I just want to make sure I'm not harming