expression

问题 So I'm attempting to build a semi complication Search expression, but I'm stuck trying to create a basic one. The expressions being used for getValueExpression look something like: x => x.PropertyA != null ? x.PropertyA.ToShortDateString() : "" //nullable datetime x => x.PropertyB //string property x => x.PropertyC != null x.PropertyC.ToString() : "" //nullable int Here is my function code, it currently errors when getValueExpression being of type Func that can't be compared to a string,

问题 So I'm attempting to build a semi complication Search expression, but I'm stuck trying to create a basic one. The expressions being used for getValueExpression look something like: x => x.PropertyA != null ? x.PropertyA.ToShortDateString() : "" //nullable datetime x => x.PropertyB //string property x => x.PropertyC != null x.PropertyC.ToString() : "" //nullable int Here is my function code, it currently errors when getValueExpression being of type Func that can't be compared to a string,

问题 I searched a lot, but nowhere is it written how to remove non-ASCII characters from Notepad++. I need to know what command to write in find and replace (with picture it would be great). If I want to make a white-list and bookmark all the ASCII words/lines so non-ASCII lines would be unmarked If the file is quite large and can't select all the ASCII lines and just want to select the lines containing non-ASCII characters... 回答1: This expression will search for non-ASCII values: [^\x00-\x7F]+

问题 i have huge string that i need to separate information. Some parts of it vary and some dont. The difficulty i am facing is that i cant find a symbol or something on which i could get the match i want. So here is the string: $str = "01;01;283;Póvoa do Vâle do Trigo;15315100 01;01;249;Alcafaz;;;;;;;;;;;3750;011;AGADÃO 01;01;2504;Caselho;;;;;;;;;;;3750;012;AGADÃO _ "15" '' ghdhghg AND IT CONTINUES so if we look at the first part of the string ( 01;01;283;Póvoa do Vale do Trigo;15315100 ), what i

问题 I'm trying to create a ylab for my plot in m/s^2. plot(mydata[,1], mydata[,3], type = "l", xlab="Time [s]", ylab=expression("Acceleration [m/s"^{2}"]"), main="Example of signal of horizontal acceleration", cex.main = 0.9) The problem is after the ^ symbol ] gets superscripted. with my code I get this error, > source('~/Dropbox/WORK/ISRProject/R_projects/plots_report.R') Error in source("~/Dropbox/WORK/ISRProject/R_projects/plots_report.R") : ~/Dropbox/WORK/ISRProject/R_projects/plots_report.R

问题 Guys I am up with evaluating a string mathematical expression. First I imported the library using System.Linq.Expressions; Then in my codes I did, Expression e = new Expression("(450*5)+((3.14*7)/50)*100"); double result = e.Evaluate(); however I get the error as Cannot create an instance of the abstract class or interface 'System.Linq.Expressions.Expression' Why the above is not working? How can I evaluate this ? 回答1: In order to evaluate expressions like this in c#, you have to use Roslyn.

问题 I am trying to convert the following excel formula to a Calculated Field in Access. Using Expressions or combination of a user defined expression with VBA code. any help appreciated! And appreciate any thoughts about data normalization, however this is not the issue. Thx IF(SMALL(T319:V319,2)>6,SMALL(T319:V319,1),IF(SMALL(T319:V319,2)=0,LARGE(T319:V319,1),SMALL(T319:V319,2) Cells T319 - V319 are fields in each record generated by a data query generated. call them A,B,C for this purpose. 回答1:

问题 I am trying to convert the following excel formula to a Calculated Field in Access. Using Expressions or combination of a user defined expression with VBA code. any help appreciated! And appreciate any thoughts about data normalization, however this is not the issue. Thx IF(SMALL(T319:V319,2)>6,SMALL(T319:V319,1),IF(SMALL(T319:V319,2)=0,LARGE(T319:V319,1),SMALL(T319:V319,2) Cells T319 - V319 are fields in each record generated by a data query generated. call them A,B,C for this purpose. 回答1:

问题 Initially got following codes. columnA and columnB only need to update if got changes. (I have columnC and so on also but just elaborate short one here). But the updatedBy and updatedTime always need to update. The following way is doing checking for each changes and updating the columns correspondingly. But this is tedious. if(isChangeColumnA && isChangeColumnB) { repo.partialUpdate(product, p=> p.columnA, p=> p.columnB, p=> p.UpdatedBy, p=> p.UpdatedTime) } else if (isChangeColumnA) { repo

问题 Trying to get an OrderBy on an IQueryable to work, not having much luck. Here's my method: public ICollection<T> FindAll<T>(Expression<Func<T,bool>> predicate, Expression<Func<T,int>> orderingKey) where T : Post { return repository .Find() .Where(predicate) .OfType<T>() .OrderBy(orderingKey) .ToPagedList(); } The ordering works if i do this: FindAll(p => p.PostName == "Foo", p => p.PostId); But not if i want to do this: FindAll(p => p.PostName == "Foo", p => p.DateModified); It doesn't work