Retrieve multiple columns from DataTable and return a DataTable using LINQ C#-CodePudding

Table: tblCustomer columns: custId(string), custFName(string), custLName(string), Address1(string), Address2(string), City(String), Zipcode(string), State(String), email(string), Phone(string).

I want to retrieve the values of these columns: custId(string), custFName(string), custLName(string), email(string), Phone(string) from tblCustomer.

I want to change the column names to Customer Id, First Name, Last Name, Email, Phone Number in the new table.

I am able to get only one column. How to get multiple columns and all rows and convert it to a DataTable

DataTable dt = tblCustomer
   .AsEnumerable()
   .Select(rows => rows.Field<string>("custId").Copytodatatable()

CodePudding user response：

Call the .ToTable method of the DataTable.DefaultView property and pass the columns in question.

var cols = new[] { "custId", "custFName", "custLName", "email", "Phone" };
var dt = tblCustomer.DefaultView.ToTable(false, cols);

var dt = tblCustomer.DefaultView.ToTable(false, 
    "custId", "custFName", "custLName", "email", "Phone");

To name the new DataTable, use an overload that takes the tableName param.

var dt = tblCustomer.DefaultView.ToTable("Customer", false, 
    "custId", "custFName", "custLName", "email", "Phone");

To rename the column captions, assign new caption to the DataColumn.Caption property of each column.

var dt = tblCustomer.DefaultView.ToTable("Customer", false, 
    "custId", "custFName", "custLName", "email", "Phone");

dt.Columns["custId"].Caption = "Customer Id";
dt.Columns["custFName"].Caption = "First Name";
dt.Columns["custLName"].Caption = "Last Name";
// ...etc.