Check if list is empty in C

Question

I have a list of objects populated from a database  I need to display an error message if the list is empty and display a grid view otherwise    How do I check if a List lt T gt  is empty in C

User · Answer

If you re using a gridview then use the empty data template  http   msdn microsoft com en-us library system web ui webcontrols gridview emptydatatemplate aspx         lt asp gridview id  CustomersGridView           datasourceid  CustomersSqlDataSource           autogeneratecolumns  true          runat  server  gt            lt emptydatarowstyle backcolor  LightBlue            forecolor  Red   gt            lt emptydatatemplate gt              lt asp image id  NoDataImage              imageurl    images Image jpg              alternatetext  No Image               runat  server   gt               No Data Found              lt  emptydatatemplate gt           lt  asp gridview gt

User · Answer

gridview itself has a method that checks if the datasource you are binding it to is empty  it lets you display something else

User · Answer

Why not     bool isEmpty    list Any    if isEmpty           error message   else          show grid     The GridView has also an EmptyDataTemplate which is shown if the datasource is empty  This is an approach in ASP NET    lt emptydatarowstyle backcolor  LightBlue  forecolor  Red   gt    lt emptydatatemplate gt      lt asp image id  NoDataErrorImg      imageurl    images NoDataError jpg  runat  server   gt       No Data Found      lt  emptydatatemplate gt

User · Answer

What about using the Count property   if listOfObjects Count    0          ShowGrid         HideError        else         HideGrid         ShowError

User · Answer

If the list implementation you re using is IEnumerable lt T gt  and Linq is an option  you can use Any   if   list Any           Otherwise you generally have a Length or Count property on arrays and collection types respectively

User · Answer

var dataSource   lst  null  amp  amp  lst Any     lst   null     bind dataSource to gird source

User · Answer

You should use a simple IF statement  List lt String gt  data   GetData     if  data Count    0      throw new Exception  Data Empty      PopulateGrid    ShowGrid

User · Answer

If  list Count  0           you can show your error messages here       else           here comes your datagridview databind          You can make your datagrid visible false and make it visible on the else section

[c#] Check if list is empty in C#

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