.net

问题 I am currently working on implement the C# version of a Gurobi linear program model that was earlier built in Python. I have a number of CSV files from which I was importing the data and creating pandas dataframes, and I was fetching columns from those dataframes to create variables that I was using in my Linear Program. The python code for creating the variables using dataframes is as follows: dataPath = "C:/Users/XYZ/Desktop/LinearProgramming/TestData" routeData = pd.DataFrame.from_csv(os

问题 I am currently working on implement the C# version of a Gurobi linear program model that was earlier built in Python. I have a number of CSV files from which I was importing the data and creating pandas dataframes, and I was fetching columns from those dataframes to create variables that I was using in my Linear Program. The python code for creating the variables using dataframes is as follows: dataPath = "C:/Users/XYZ/Desktop/LinearProgramming/TestData" routeData = pd.DataFrame.from_csv(os

问题 This question already has answers here : How do I use reflection to call a generic method? (8 answers) Closed 6 years ago . Suppose I have an unconstrained generic method that works on all types supporting equality. It performs pairwise equality checks and so works in O(n 2 ) : public static int CountDuplicates<T>(IList<T> list) { /* ... */ } I also have a constrained generic method that only works with types supporting sorting. It starts from sorting the list in O(n log n) , and then counts

问题 This question already has answers here : Where the 'Type' of a reference value is stored in memory? (3 answers) Do value types have Type objects? (2 answers) Closed 19 days ago . I am reading a book which shows how a class instance is created in heap as the picture below shows: internal class Employee { public Int32 GetYearsEmployed() { ... } public virtual String GetProgressReport() { ... } public static Employee Lookup(String name) { ... } } internal sealed class Manager : Employee { public

问题 In Short, I need to figure out how to use Google API's to do a Google Image Search Based off of text in a RichBox named "Title" and ONLY bold words in another RichBox named "Body". The idea of this is to create an Image Suggestion page that will be used to help produce PowerPoint slides. Here is the code I've Tried to Get a Google Image Search going. For Start we have two RichBoxes named "Title" & "Body". Whatever the user types in the "Title" box, it gets stored in a List of "Search Term"

问题 I wonder why is the reason why this code never finishes its execution. It makes use of MoreLinq void Main() { var values = MoreEnumerable.Random(1, 200); var filtered = MyMethod(values) .Take(2) .Dump(); } public IEnumerable<int> MyMethod(IEnumerable<int> source) { return source .Select(x => new[] { x }) .Aggregate((a, b) => new[] { a.Last() + b.First()}); } 回答1: Because MoreEnumerable.Random(1, 200) returns an infinite sequence and the .Aggregate statement in MyMethod is trying to enumerate

问题 I want to filter a list using LINQ with Where extension method. But apart from filtering I also want to update a global variable inside Where . However I cannot do it. Consider this example: var list = new List<string> { "1", "2", "3", "4", "5" }; bool flag = false; var newList = list.Where(item => { flag = true; return item == "2"; }); // Here I expect flag = true, but in fact it's false Console.Write(flag); As you can see I set flag = true , still the value flag == false after execution. It

问题 I've created a web application that generates and allows the user to download an Excel file, It worked fine on the Visual Studio LocalHost. After I've launched it to the IIS server everything works just fine except the Generation of the excel file. The code died the first time that he is trying to select range in the work sheet - The error is the NULL error("Object reference...") I guess it kind of permission but I couldn't find one. Any Idea? Thanks. 回答1: As noted in comments use of Office

问题 I have a Visual Studio solution that contains multiple C# projects and a C++ project. The C++ project is properly configured to build both for x64 and win32 (has separate output directories, proper binaries referred for 32 and 64 and so on) and default configuration is x64. C# projects are configured for Any CPU. How can I configure my solution to build the C++ project for both x64 and win32 when building the entire solution? P.S.: Batch build won't do the job for this case because I need to

问题 I have a Visual Studio solution that contains multiple C# projects and a C++ project. The C++ project is properly configured to build both for x64 and win32 (has separate output directories, proper binaries referred for 32 and 64 and so on) and default configuration is x64. C# projects are configured for Any CPU. How can I configure my solution to build the C++ project for both x64 and win32 when building the entire solution? P.S.: Batch build won't do the job for this case because I need to