datarow

I need to add newRow to MyHandler and it should add that row to the table that was built internally from the "scheme" that was passed to the MyHandler. The problem is when I use dt.ImportRow(row); it doesn't add any row. If I add newRow to t table and then do handler.Add(t.row[t.Rows.Count - 1]); so it works, but I don't want to add to t table. The t is just so I could create new row. Why dt.ImportRow(row); doesn't work? How to fix it? { var t = new DataTable(); t.Columns.Add(new DataColumn("Col1", typeof(string))); t.Columns.Add(new DataColumn("Col2", typeof(byte))); t.Columns.Add(new

I want to change a Datarow value. I want to change DT2[0].ItemArray[3] I tried this code, but it didn't work. private void Func(DataRow[] DtRowTemp) { DataRow[] DT2 ; DT2 = DtRowTemp; // It work and DTRowTemp value has set to DT2 // above code don't work DT2[0].ItemArray[3] = 3; // Last Value Was 2 and I want to change this value to 3 } With the ItemArray Property you get or set the ENTIRE array, not a single value. Use this to set the fourth item: DT2[0][3] = 3; 来源： https://stackoverflow.com/questions/6885087/unable-to-change-datarow-value

How do I add a new DataColumn to a DataTable object that already contains data? PseudoCode //call SQL helper class to get initial data DataTable dt = sql.ExecuteDataTable("sp_MyProc"); dt.Columns.Add("NewColumn", type(System.Int32)); foreach(DataRow row in dr.Rows) { //need to set value to NewColumn column } marc_s Just keep going with your code - you're on the right track: //call SQL helper class to get initial data DataTable dt = sql.ExecuteDataTable("sp_MyProc"); dt.Columns.Add("NewColumn", typeof(System.Int32)); foreach(DataRow row in dt.Rows) { //need to set value to NewColumn column row[

I have two columns in a datatable: ID, Calls. How do I find what the value of Calls is where ID = 5 ? 5 could be anynumber, its just for example. Each row has a unique ID. Make a string criteria to search for, like this: string searchExpression = "ID = 5" Then use the .Select() method of the DataTable object, like this: DataRow[] foundRows = YourDataTable.Select(searchExpression); Now you can loop through the results, like this: int numberOfCalls; bool result; foreach(DataRow dr in foundRows) { // Get value of Calls here result = Int32.TryParse(dr["Calls"], out numberOfCalls); // Optionally,

Sample code: DataTable table = new DataTable(); // ... // insert column to table table.Columns.Add("name"); // ... // insert value to table foreach (DataRow row in table.Rows) { row["name"]; row.Field<string>("name"); } My question is: Is there a difference between using row["name"] and row.Field<string>("name") ? Of course, the second way cast value to some type, but is there another difference? Which method is better to use? See Remarks section , main differences described there: The DataSet class represents null values with the Value instance of the DBNull class. A Language-Integrated Query