expression

问题 Here is my code: String test = "12+23-42-53+4-31"; int counter = 0; Stack<Integer> numb= new Stack<Integer>(); Stack<String> op = new Stack<String>(); for(int i = 0; i<test.length();i++){ if(test.charAt(i)=='-' || test.charAt(i)=='+'){ int number = Integer.parseInt(test.substring(counter, i)); counter=i+1; numb.push(number); String oper = Character.toString(test.charAt(i)); op.push(oper); } } If I loop through numb stack then the last number of test string is missing. Are there any solutions?

问题 Need a JSON path expression for below JSON. I wanted to extract "Id" for each specific "name" For Example: I need to extract "Id" : "3" for "name" : "XYZ" . I tried a JSON path expression as $..Id which given output as: [ "1", "2", "3" ] But I needed an Id specific to "name": "XYZ"` [ { "primary":{ "name":"ABC" }, "Id":"1" }, { "primary":{ "name":"PQR" }, "Id":"2" }, { "primary":{ "name":"XYZ" }, "Id":"3" } ] 回答1: Able to resolve this by below expression $..[?(@.primary.name == 'XYZ')].Id 来源：

问题 I'd like to create an Expression<Func<TEntity, object>> so as to later pass it to function as parameter. If I use the following function for creating it... public Expression<Func<TEntity, object>> GetInclude(string property) { ParameterExpression parameter = System.Linq.Expressions.Expression.Parameter(typeof(TEntity)); System.Linq.Expressions.Expression ppty = System.Linq.Expressions.Expression.Property(parameter, property); LambdaExpression lambda = System.Linq.Expressions.Expression.Lambda

问题 I would appreciate if you clarify this for me.Here are two recent questions with their accepted answers: 1) What is the difference between *myptr++ and *(myptr++) in C 2) Yet another sequence point query: how does *p++ = getchar() work? The accepted answer for the first question,concise and easily to understand states that since ++ has higher precedence than * , the increment to the pointer myptr is done first and then it is dereferenced.I even checked that out on the compiler and verified it

问题 I'm currently working on a project at work, and we are using the Telerik RadControls for Silverlight. In their Q1 2011 release, they added a new control called the Rad Expression Editor. In the Rad Expression Editor, you can pass in an object and create formulas (or expressions), and the editor window will give you a preview of the result of the expression. I've spoken with Telerik about this and they intentionally did not expose the result of this, but mentioned that I could use

问题 I am trying to filter a numeric string by matching the start of the source string and the length of the search string. All the filtered columns are strings. Most are just words, but there is one column that has values that look like this 001302:Alt# . The underlying data source sucks, but I cannot change the structure. The numbers are grouped based on the left-hand values (i.e. 050110 and 050534 are both related to client(05), 052123 is related to client(05) invoices(2)). My users want to be

问题 If an expression evaluates multiple && operators, and does not evaluate any operators of lower precedence (eg. || , ?: ), will the expression evaluate to 0 as soon as one of the && s return 0, or will it finish evaluating the remaining && s? For example, q=0; w=1; e=1; r=1; if(q && w && r && e) {} Will this if() evaluate to false as soon as q && w evaluates to 0 (since the remaining && must all evaluate to 0 regardless of the right hand operators)? 回答1: Yes, evaluation will terminate early (

问题 I need to check type to display correct message like: ${row.type} <c:if test="${row.stype ==\"Note\" }">Important Note</c:if> But the problem that escaping produce strange error: Unable to analyze EL expression due to lexical analysis error How it can be fixed? Thanks. 回答1: Double quotes must not be escaped in EL. Use single quotes if the tag attribute is in double quotes, and vice-versa: <c:if test="${row.stype == 'Note'}">Important Note</c:if> or <c:if test='${row.stype == "Note"}'

问题 Reading from a flat file that has a column containing the year and month in the following format --> "201212". I need to insert this into a DATETIME2 column but first I must parse it with "/" and add a "01" as the day. Such that 201212 would become 2012/12/01 My expression in my Derived Column Transformation looks like this: (DT_DBTIMESTAMP2,0)((DT_WSTR,4)SUBSTRING(RptMthDTM,1,4) + "/" + (DT_WSTR,2)SUBSTRING(RptMthDTM,5,2) + "/" + "01") This seems like it should work and SSIS accepts this(as

问题 Does anyone know of an existing solution to translate a LINQ Expression to HQL statement? Thanks in advance to all the good samaritans out there. P.S. We already use Linq to NHibernate. However, it only works for select statements, whereas HQL is good for other statement kinds, like delete. So, Linq to NHibernate is not the answer. 回答1: Linq to nhibernate has just been released . Does that help? 回答2: I had the exact same need: I needed to delete using a LINQ expression, but NHibernate only