dataset

问题 I need to merge two data schema into one. I have Schema1 and Schema2. I need to join these two into Schema3. Furthermore, I have a Select statement which queries a data set but I can't figure out how to use the select statement on the data set containing both tables (both Schema1 and Schema2) and combine them into the new table schema3 which is a table in the same data set comprised of both table's fields. Example Schema 1 ID, Food, Book, Rice, Cave Schema 2 ID , Carpet, Strings, Run Schema 3

问题 Apologies - I know there's lots of info out there about this subject, but that's precisely the problem - so much info about this - hard to piece it all together to understand/get it working. So many concepts and approaches involved. Basically have read an xml file into a Dataset. I want to be able to display the dataset in a datagridview, filterable by "controlleralias.alias" (tablename.field) and by "system.name" (names from the dataset visualizer). Then, any edits within the datagirdview

问题 Hello everone I have a function public void RemoveStock(string tickerName) { int key = this.getKeyFromtickerName(tickerName); foreach (var item in listingDataTable.Where( x => x.stock == key).ToList()) { listingDataTable.RemoveListingRow(item); } listingTa.Update(listingDataTable); } Definitions: listingDataTable = new stockDataSet.ListingDataTable(); listingTa = new stockDataSetTableAdapters.ListingTableAdapter(); Database type: SQL Server Compact Edition The function remove rows from the

问题 Hello everone I have a function public void RemoveStock(string tickerName) { int key = this.getKeyFromtickerName(tickerName); foreach (var item in listingDataTable.Where( x => x.stock == key).ToList()) { listingDataTable.RemoveListingRow(item); } listingTa.Update(listingDataTable); } Definitions: listingDataTable = new stockDataSet.ListingDataTable(); listingTa = new stockDataSetTableAdapters.ListingTableAdapter(); Database type: SQL Server Compact Edition The function remove rows from the

问题 I have an array of strings and need to convert them to a dataset. Is there some shortcut way to do this? For example: string[] results = GetResults(); DataSet myDataSet = new DataSet(); results = myDataSet.ToDataSet(); // Convert array to data set I’m not too bothered about formatting or structure. 回答1: I can't see any value in this but if you really must do as you request, the following code will create a dataset with a single table that has a single column and a row per item in the array.

问题 Good day I am a beginner at vb.net programming and I'm having a problem about searching or filtering the datagridview using textbox. I have a one textbox for searching and a two button for retrieving values which is the student and vehicle. When the student button clicked the data for student is displayed and same for vehicle but when I move the "Dim dtaset As New DataTable" outside the events of students,vehicle and searchtxt the search is successfully filtering the data of the datavalues

问题 I am bring data in many Table so I want it to convert it to json while returning it. So I tried like below public static string DataSetToJSON(DataSet dset) { JavaScriptSerializer jsSerializer = new JavaScriptSerializer(); List<Dictionary<string, object>> parentRow = new List<Dictionary<string, object>>(); Dictionary<string, object> childRow; foreach (DataRow row in dset.Rows) { childRow = new Dictionary<string, object>(); foreach (DataColumn col in dset.Columns) { childRow.Add(col.ColumnName,

问题 I have created a UserControl which has a picture and two labels: labelName labelUsername I have also created a DataSet and DataTable which gets the data from a SQL CE database. This bit is working fine as I managed to loop through all the DataTable rows and display the information in a MessageBox. Now I want to display the UserControl in a FlowLayoutPanel for all rows in the DataTable and populate the two labels with the Name and Username values from the DataTable. This is where I am stuck as

问题 Here is the situation: I have a dataset bound to a WPF window. The dataset implements the IDataErrorInfo, so when a value is changed in the window, a validation occurs for the specific property changed. During validation, I may find out there is another control in the window I need to validate. I know only the field name in the Dataset that I need to validate, and not the actual control that binds to this field. So my questions are: 1. How can I find out what control binds to a specific field

问题 Okay so here's the deal. I have to use the BaylorEdPsych package in R to test whether the dataset that I have is MCAR or not. I ran the LittleMCAR function in it with the sample dataset (EndersTable1_1) and it worked flawlessly. When I try to run the dataset that I have into the function I get this error: Error in eigen(sampmat, symmetric = TRUE) : infinite or missing values in 'x' I don't understand why this would throw an error when my dataset conforms to the structure of the sample data.