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The tables must be mapped to existing database tablestables that already exist in the database, as explained in the previous section. Each query is defined for a specific database and may contain a predefined SQL Statement.
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Then, you can use that given name (2) to get control of the element and change its properties. The below is an example.
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TDataGridWindow grid = CurrentDisplay.GetDataGrid("Employees");
grid.GridControl.SetColumnSparkline("Orders", this.SparklineCollectionDelegate, style);
// SetColumnSparkline parameters - fieldName (string)
// - populateCallback (SparklineCollectionDelegate)
// - style (string)
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| Note |
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A delegate will only call a method that agrees with its signature and return type. A method can be either a static method associated with a class, or it can be an instance method associated with an object. |
Below is a callback. The system will always look for a code EXACTLY like this one to create the Sparkline. So if you want to use this feature, you MUST have this code on your code behind.
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Dictionary<int, ArgumentValue[]> mapEmployeeToOrders = null;
private ArgumentValue[] SparklineCollectionDelegate(string fieldName, System.Data.DataRow row)
{
ArgumentValue[] sourceCollection;
int emplID = TK.To< int>(row["EmployeeID"]);
if (!this.mapEmployeeToOrders.TryGetValue(emplID, out sourceCollection))
sourceCollection = new ArgumentValue[0];
return sourceCollection;
} |
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