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问题 I got a Vehicle table with lots of info but one of the columns being 'Owner' in a MSSQL table But one of the owners i can't select when i use LIKE but can if i use = 'Silkeborg Distributionscenter' is the owner (Yes there is a double space in both the table and the param) So the param is: DECLARE @Owners nvarchar(MAX) = 'Silkeborg Distributionscenter' I tried: SELECT * FROM Vehicle WHERE @Owners = Owner --This gave me all the correct results Then: SELECT * FROM Vehicle WHERE @Owners LIKE

问题 If I create a user level application setting and bind it to a text box on a form, then type something in the textbox, the value is automatically saved and when the application is launched again the value appears in the textbox. This doesn't happen when I scope the setting as application. Why are application scoped settings not saved automatically like user scoped settings are? If this is by design, how can I manually save these settings and load them at runtime? 回答1: In short, application

问题 I have a problem binding data to a WPF DataGrid using Python.NET The code is shown below, and I've tried three different approaches to binding data - each fails and the error message is included as a comment in the code below If I do not attempt to add data, the datagarid displays correctly with headers. But I'm unable to populate the grid with any data. Any help will be gratefully received!!! Doug import clr #.NET references import System import System.Windows.Controls as WPFControls import

问题 I have a question about how to change a coefficient in the constraint. For example, I have the following constraint: lhs.addTerms(temp, x[i]) model.addConstr(cost, GRB.EQUAL, 1.0/a*lhs, 'cost_cons') If I want change "temp" in the next iteration, how to modify the model? Thanks very much 回答1: Could you give a little more information? What I think you want to do is change the coefficients of x[i] in that particular constraint. If that's it, then you should save the constraint by assigned it to

问题 I have encountered such a simple challenge, and yet don't know how to do this properly. library(tibble) library(dplyr) # I have this single-cell dataframe tibble::tribble(~red, "apple") ## # A tibble: 1 x 1 ## red ## <chr> ## 1 apple But being red is a property of the variable fruit , which apple is one observation of. Therefore, I want my data to look like: # Desired Output: ## # A tibble: 1 x 2 ## fruit red ## <chr> <lgl> ## 1 apple TRUE So I tried a clunky method, which seems not best

问题 If I create a user level application setting and bind it to a text box on a form, then type something in the textbox, the value is automatically saved and when the application is launched again the value appears in the textbox. This doesn't happen when I scope the setting as application. Why are application scoped settings not saved automatically like user scoped settings are? If this is by design, how can I manually save these settings and load them at runtime? 回答1: In short, application

问题 I need to inherit a collection of items of the current type, like this class A { // some properties... public ICollection<A> Children; } class B: A { // other properties } This mostly works as expected. The problem is I can do something like this class C: A { } B b = new B(); b.Children = new List<C>(); Is there any way to force b.Children to be a collection of B ? 回答1: No, there is no way to do such thing yet. The C# language has no artifact to declare such thing: class A { public

问题 I have encountered such a simple challenge, and yet don't know how to do this properly. library(tibble) library(dplyr) # I have this single-cell dataframe tibble::tribble(~red, "apple") ## # A tibble: 1 x 1 ## red ## <chr> ## 1 apple But being red is a property of the variable fruit , which apple is one observation of. Therefore, I want my data to look like: # Desired Output: ## # A tibble: 1 x 2 ## fruit red ## <chr> <lgl> ## 1 apple TRUE So I tried a clunky method, which seems not best

问题 I have a problem binding data to a WPF DataGrid using Python.NET The code is shown below, and I've tried three different approaches to binding data - each fails and the error message is included as a comment in the code below If I do not attempt to add data, the datagarid displays correctly with headers. But I'm unable to populate the grid with any data. Any help will be gratefully received!!! Doug import clr #.NET references import System import System.Windows.Controls as WPFControls import

问题 I have a problem binding data to a WPF DataGrid using Python.NET The code is shown below, and I've tried three different approaches to binding data - each fails and the error message is included as a comment in the code below If I do not attempt to add data, the datagarid displays correctly with headers. But I'm unable to populate the grid with any data. Any help will be gratefully received!!! Doug import clr #.NET references import System import System.Windows.Controls as WPFControls import