Gets the number of allowable characters that can be stored in the Column.
Namespace:
ESRI.ArcGISExplorer.DataAssembly: ESRI.ArcGISExplorer (in ESRI.ArcGISExplorer.dll) Version: 2.0.0.1500 (2.0.0.1500)
Syntax
Field Value
The number of characters that can be stored in the Column. This property only applies to Text and Blob ColumnType values.Examples
The code below provides a number of examples for working with ColumnCollection and Column properties.
The Length property is used in the first example to print the number of characters that can be stored in
"Region" column.
CopyC#
//Open the Regions feature class stored in the Scotland file geodatabase Geodatabase gdb = new Geodatabase(@"C:\Data\Scotland.gdb"); Table regionsTable = gdb.OpenTable("regions"); //Example 1 - column properties for the non-spatial, "Region" Column Column regionColumn = regionsTable.Columns["Region"]; System.Diagnostics.Debug.Print(regionColumn.Name); //Prints "Region" System.Diagnostics.Debug.Print(regionColumn.AliasName); //Prints "Region" System.Diagnostics.Debug.Print(regionColumn.Type.ToString()); //Prints "String" System.Diagnostics.Debug.Print(regionColumn.Length.ToString()); //Prints "50" //Check that the parent data container is a geodatabase as the IsNullable and Required column //properties only apply to this data format if (regionsTable.Parent is Geodatabase) { System.Diagnostics.Debug.Print(regionColumn.IsNullable.ToString()); //Prints "True" System.Diagnostics.Debug.Print(regionColumn.Required.ToString()); //Prints "False" } //Example 2 - column properties for the non-spatial, "ObjectID" column //Check that the Regions table has a unique identifier column if (regionsTable.Columns.HasObjectIDColumn) { //Get the unique identifier column Column oidColumn = regionsTable.Columns[regionsTable.Columns.ObjectIDColumnName]; System.Diagnostics.Debug.Print(oidColumn.Name); //Prints "OBJECTID" System.Diagnostics.Debug.Print(oidColumn.Required.ToString()); //Prints "True" System.Diagnostics.Debug.Print(oidColumn.IsNullable.ToString()); //Prints "False" } //Example 3 - column properties for the spatial, "Shape" column //Check that the Regions table can contain vector data if (regionsTable.IsSpatial) { //Get the column that can store geometry Column shapeColumn = regionsTable.Columns[regionsTable.Columns.SpatialColumnName]; System.Diagnostics.Debug.Print(shapeColumn.Name); //Prints "Shape" System.Diagnostics.Debug.Print(shapeColumn.CoordinateSystem.Name); //Prints "British_National_Grid" System.Diagnostics.Debug.Print(shapeColumn.HasZ.ToString()); //Prints "False" //check that this table can store Polygon geometries if (shapeColumn.GeometryType == GeometryType.Polygon) { //Get the column which stores the perimeter length of each geometry Column lengthCol = regionsTable.Columns[regionsTable.Columns.LengthColumnName]; System.Diagnostics.Debug.Print(lengthCol.Name); //Prints "Shape_Length" //Gets the column which stores the area of each geometry Column areaCol = regionsTable.Columns[regionsTable.Columns.AreaColumnName]; System.Diagnostics.Debug.Print(areaCol.Name); //Prints "Shape_Area" } }
CopyVB.NET
'Open regions feature class stored in the Scotland file geodatabase Dim gdb As Geodatabase = New Geodatabase("C:\Data\Scotland.gdb") Dim regionsTable As Table = gdb.OpenTable("regions") 'Example 1 - column properties for the non-spatial "Region" Column Dim regionColumn As Column = regionsTable.Columns.Item("Region") System.Diagnostics.Debug.Print(regionColumn.Name) 'Prints "Region" System.Diagnostics.Debug.Print(regionColumn.AliasName) 'Prints "Region" System.Diagnostics.Debug.Print(regionColumn.Type.ToString()) 'Prints "String" System.Diagnostics.Debug.Print(regionColumn.Length.ToString()) 'Prints "50" 'Check that the parent data container is a geodatabase as the IsNullable and Required column 'properties only apply to this data format If TypeOf regionsTable.Parent Is Geodatabase Then System.Diagnostics.Debug.Print(regionColumn.IsNullable.ToString()) 'Prints "True" System.Diagnostics.Debug.Print(regionColumn.Required.ToString()) 'Prints "False" End If 'Example 2 - column properties for the non-spatial, "ObjectID" column 'check that the Regions table has a unique identifier column If (regionsTable.Columns.HasObjectIDColumn) Then 'Get the unique identifier column Dim oidColumn As Column = regionsTable.Columns.Item(regionsTable.Columns.ObjectIDColumnName) System.Diagnostics.Debug.Print(oidColumn.Name) 'Prints "OBJECTID" System.Diagnostics.Debug.Print(oidColumn.Required.ToString()) 'Prints "True" System.Diagnostics.Debug.Print(oidColumn.IsNullable.ToString()) 'Prints "False" End If 'Example 3 - column properties for the spatial, "Shape" column 'check that the Regions table can contain vector data If regionsTable.IsSpatial Then 'Get the column that can store geometry Dim shapeColumn As Column = regionsTable.Columns.Item(regionsTable.Columns.SpatialColumnName) System.Diagnostics.Debug.Print(shapeColumn.Name) 'Prints "Shape" System.Diagnostics.Debug.Print(shapeColumn.CoordinateSystem.Name) 'Prints "British_National_Grid" System.Diagnostics.Debug.Print(shapeColumn.HasZ.ToString()) 'Prints "False" 'check that this table can store Polygon geometries If shapeColumn.GeometryType = GeometryType.Polygon Then 'Get the column which stores the perimeter length of each geometry Dim lengthCol As Column = regionsTable.Columns.Item(regionsTable.Columns.LengthColumnName) System.Diagnostics.Debug.Print(lengthCol.Name) 'Prints "Shape_Length" 'Gets the column which stores the area of each geometry Dim areaCol As Column = regionsTable.Columns.Item(regionsTable.Columns.AreaColumnName) System.Diagnostics.Debug.Print(areaCol.Name) 'Prints "Shape_Area" End If End If