You can use Linq to DataTable: var ids = dt.AsEnumerable().Select(r => r.Field<int>(“id”)).ToList(); UPDATE: Without Linq List<int> ids = new List<int>(dt.Rows.Count); foreach(DataRow row in dt.Rows) ids.Add((int)row[“id”]); Note for efficiency it’s better to use row[index] instead of row[columnName]. First one just gets column by index from columns array. Latter gets column index from internal dictionary which maps … Read more
Absolutely: class B { private A m_a = new A(); public event EventType EventB { add { m_a.EventA += value; } remove { m_a.EventA -= value; } } } In other words, the EventB subscription/unsubscription code just passes the subscription/unsubscription requests on to EventA. Note that this doesn’t allow you to raise the event just … Read more
TLS (Transport Level Security) is the slightly broader term that has replaced SSL (Secure Sockets Layer) in securing HTTP communications. So what you are being asked to do is enable SSL.
You need to change this line SqlCommand cmd = new SqlCommand(“update Contact_Info set CustInfo=” + ds.GetXml() + ” WHERE Customer_ID=” + a + “”, scon); in this way SqlCommand cmd = new SqlCommand(“update Contact_Info set CustInfo=” + ds.GetXml() + ” WHERE Customer_ID=” + a + “”, scon, sqlTrans); The error message states exactly the problem. … Read more
Use the ToDictionary method: Dictionary<string, string> dString = dObject.ToDictionary(k => k.Key, k => k.Value.ToString()); Here you reuse the key from the original dictionary and you convert the values to strings using the ToString method. If your dictionary can contain null values you should add a null check before performing the ToString: Dictionary<string, string> dString = … Read more
Assuming you have access to LINQ, and Age is an int (you may also try var maxAge – it is more likely to compile): int maxAge = myTypes.Max(t => t.Age); If you also need the RandomID (or the whole object), a quick solution is to use MaxBy from MoreLinq MyType oldest = myTypes.MaxBy(t => t.Age);
Using the Roslyn scripting API (more samples here): // add NuGet package ‘Microsoft.CodeAnalysis.Scripting’ using Microsoft.CodeAnalysis.CSharp.Scripting; await CSharpScript.EvaluateAsync(“System.Math.Pow(2, 4)”) // returns 16 You can also run any piece of code: var script = await CSharpScript.RunAsync(@” class MyClass { public void Print() => System.Console.WriteLine(1); }”) And reference the code that was generated in previous runs: await script.ContinueWithAsync(“new … Read more
Just use this constructor of List<T>. It accepts any IEnumerable<T> as an argument. string[] arr = … List<string> list = new List<string>(arr);