Class FieldDescriptor

FieldDescriptor provides mapping information to a column of the underlying datasource.

Fields are managed by the FieldDescriptorCollection that is returned by the Fields property of a TableDescriptor.

Inheritance

System.Object

ShouldSerializeBasedPersisterType

DescriptorBase

FieldDescriptor

ExpressionFieldDescriptor

Implements

System.ComponentModel.ICustomTypeDescriptor

System.IDisposable

System.ICloneable

IStandardValuesProvider

Inherited Members

DescriptorBase.Dispose()

DescriptorBase.OnDisposed(EventArgs)

DescriptorBase.CanResetValue()

DescriptorBase.Reset()

DescriptorBase.ShouldSerialize()

DescriptorBase.Disposing

DescriptorBase.InDisposed

DescriptorBase.IsDisposed

DescriptorBase.Disposed

ShouldSerializeBasedPersisterType.GetNewAttributesCount(PropertyDescriptor)

ShouldSerializeBasedPersisterType.AddNewAttributes(PropertyDescriptor, Attribute[], Int32)

ShouldSerializeBasedPersisterType.GetCustomPDC(PropertyDescriptorCollection)

ShouldSerializeBasedPersisterType.CheckAllProperties

System.Object.Equals(System.Object, System.Object)

System.Object.ReferenceEquals(System.Object, System.Object)

System.Object.GetType()

System.Object.MemberwiseClone()

Namespace: Syncfusion.Grouping

Assembly: Syncfusion.Grouping.Base.dll

Syntax

public class FieldDescriptor : DescriptorBase, ICustomTypeDescriptor, IDisposable, ICloneable, IStandardValuesProvider

Constructors

FieldDescriptor()

Initializes a new instance for FieldDescriptor FieldDescriptor class.

Declaration

public FieldDescriptor()

FieldDescriptor(String)

Initializes a new instance for FieldDescriptor FieldDescriptor class. with a name.

Declaration

public FieldDescriptor(string name)

Parameters

Type	Name	Description
System.String	name	Name of the field descriptor.

FieldDescriptor(String, String, Boolean, String)

Initializes a new instance for FieldDescriptor FieldDescriptor class. with a name, mapping name, Read-only setting, and default value for NULL fields.

Declaration

public FieldDescriptor(string name, string mappingName, bool readOnly, string defaultValue)

Parameters

Type	Name	Description
System.String	name	The Name for FieldDescriptor.
System.String	mappingName	Mapping name.
System.Boolean	readOnly	Indicates if the descriptor is read-only.
System.String	defaultValue	Default value.

FieldDescriptor(String, Type)

Initializes a new instance for FieldDescriptor FieldDescriptor class. with a name and a type. Use this constructor only for unbound fields.

Declaration

public FieldDescriptor(string name, Type type)

Parameters

Type	Name	Description
System.String	name	Field descriptor name.
System.Type	type	Type of the descriptor.

Properties

AllowTrimEnd

Gets or sets whether the GetValue(Record) method should trim whitespace at end of text if field is a string. This is useful if databases return string with fixed character length and fill up the rest of field with blanks. (Default is True.)

Declaration

public virtual bool AllowTrimEnd { get; set; }

Property Value

Type	Description
System.Boolean

Collection

The collection this descriptor belongs to.

Declaration

public FieldDescriptorCollection Collection { get; }

Property Value

Type	Description
FieldDescriptorCollection

DefaultValue

Gets of sets the default value that should be used for empty fields in the AddNewRecord.

Declaration

public string DefaultValue { get; set; }

Property Value

Type	Description
System.String

FieldPropertyType

Gets or sets the property type.

Declaration

public Type FieldPropertyType { get; set; }

Property Value

Type	Description
System.Type

FieldPropertyTypeString

Gets or sets Serialize helper for XML Serialization of FieldPropertyType

Declaration

public string FieldPropertyTypeString { get; set; }

Property Value

Type	Description
System.String

ForceImmediateSaveValue

Gets or sets whether changes to the field in a record should immediately trigger a SaveValue event without first calling BeginEdit on the current record. This property is useful if you do want to have unbound fields that should not trigger ListChanged events when only the unbound property is modified on the current record.

Declaration

public virtual bool ForceImmediateSaveValue { get; set; }

Property Value

Type	Description
System.Boolean

Hide

Gets or sets Hide state of the field.

Declaration

public virtual bool Hide { get; set; }

Property Value

Type	Description
System.Boolean

IsSorting

Internal only.

Declaration

public bool IsSorting { get; set; }

Property Value

Type	Description
System.Boolean

MappingName

Gets or sets the mapping for this field. You should specify which field of a System.Data.DataTable or strong-typed collection you want to display in the grid at this field. The MappingName can also point to a property inside a complex object with nested properties of a collection when a '.' is specified.

Declaration

public string MappingName { get; set; }

Property Value

Type	Description
System.String

Name

Gets or sets the name of the field.

Declaration

public virtual string Name { get; set; }

Property Value

Type	Description
System.String

PreventUnboundFieldTypeCheck

Internal only.

Declaration

public static bool PreventUnboundFieldTypeCheck { get; set; }

Property Value

Type	Description
System.Boolean

ReadOnly

Gets or set Read-only state of the field.

Declaration

public virtual bool ReadOnly { get; set; }

Property Value

Type	Description
System.Boolean

ReferencedFields

Gets or sets ReferencedFields state of the field. Use a semicolon as delimiter when specifying multiple fields. The Engine will use these fields in the ListChanged event to determine which cells to update when a change was made in an underlying field.

Declaration

public virtual string ReferencedFields { get; set; }

Property Value

Type	Description
System.String

TableDescriptor

Gets the TableDescriptor that this descriptor belongs to.

Declaration

public TableDescriptor TableDescriptor { get; }

Property Value

Type	Description
TableDescriptor

Methods

Clone()

Creates a copy of this descriptor.

Declaration

public virtual FieldDescriptor Clone()

Returns

Type	Description
FieldDescriptor	A copy of this descriptor.

CopyAllMembersTo(FieldDescriptor)

Copies all properties to another element without raising Changing or Changed events.

Declaration

protected void CopyAllMembersTo(FieldDescriptor fd)

Parameters

Type	Name	Description
FieldDescriptor	fd	The target object.

DetermineReferencedFields()

Returns an array of field descriptor names that the expression references.

Declaration

protected virtual string DetermineReferencedFields()

Returns

Type	Description
System.String	Returns array of field descriptor names.

Dispose(Boolean)

Releases all resources used by the System.ComponentModel.Component.

Declaration

protected override void Dispose(bool disposing)

Parameters

Type	Name	Description
System.Boolean	disposing	true to release both managed and unmanaged resources; false to release only unmanaged resources.

Overrides

DescriptorBase.Dispose(Boolean)

Remarks

See the documentation for the System.ComponentModel.Component class and its Dispose member.

Equals(Object)

Compares two field descriptors.

Declaration

public override bool Equals(object obj)

Parameters

Type	Name	Description
System.Object	obj	Field descriptor.

Returns

Type	Description
System.Boolean	True if the descriptors are equal; False otherwise.

Overrides

System.Object.Equals(System.Object)

GetComplexPropertyDescriptors()

Gets the complex property descriptor this descriptor holds. If this field descriptor is not a wrapper object for a nested property inside a complex object, the method will return NULL.

Declaration

public PropertyDescriptor[] GetComplexPropertyDescriptors()

Returns

Type	Description
System.ComponentModel.PropertyDescriptor[]	A complex property descriptor.

GetExpressionFieldDescriptor()

Gets the expression field descriptor this descriptor holds. If this field descriptor is not a wrapper object for a expression field, the method will return NULL.

Declaration

public ExpressionFieldDescriptor GetExpressionFieldDescriptor()

Returns

Type	Description
ExpressionFieldDescriptor	An expression field descriptor.

GetHashCode()

Serves as a hash function.

Declaration

public override int GetHashCode()

Returns

Type	Description
System.Int32	Hash code.

Overrides

System.Object.GetHashCode()

GetName()

Returns the name of the descriptor.

Declaration

public override string GetName()

Returns

Type	Description
System.String	Field descriptor name.

Overrides

DescriptorBase.GetName()

GetNestedRelatedDescriptor()

Gets a nested related field descriptor of a related table that this descriptor holds.

Declaration

public FieldDescriptor GetNestedRelatedDescriptor()

Returns

Type	Description
FieldDescriptor	Nested related field descriptor.

GetParentFieldDescriptor()

Gets a related field descriptor of a related table that this descriptor holds. If this field descriptor is not a wrapper object for a field in a related table, the method will return NULL.

Declaration

public FieldDescriptor GetParentFieldDescriptor()

Returns

Type	Description
FieldDescriptor	A field descriptor of the related table.

GetPropertyDescriptor()

Gets the property descriptor this descriptor holds. If this field descriptor is not a wrapper object for a property in the main table (and also not a nested property inside a complex object), the method will return NULL.

Declaration

public PropertyDescriptor GetPropertyDescriptor()

Returns

Type	Description
System.ComponentModel.PropertyDescriptor	A property descriptor.

GetPropertyType()

Gets the result type of this field.

Declaration

public virtual Type GetPropertyType()

Returns

Type	Description
System.Type	Property type.

GetRelatedDescriptor()

Gets a related field descriptor of a related table that this descriptor holds. If this field descriptor is not a wrapper object for a field in a related table, the method will return NULL.

Declaration

public FieldDescriptor GetRelatedDescriptor()

Returns

Type	Description
FieldDescriptor	A field descriptor of the related table.

GetRelatedSummaryDescriptor()

Gets a related summary descriptor of a related table that this descriptor holds. (for RelationKind.ForeignKeyKeyWords)

Declaration

public SummaryDescriptor GetRelatedSummaryDescriptor()

Returns

Type	Description
SummaryDescriptor	A summary descriptor of the related table.

GetRelation()

Gets the relation descriptor this descriptor holds. If this field descriptor is not a wrapper object for a field in a related table, the method will return NULL.

Declaration

public RelationDescriptor GetRelation()

Returns

Type	Description
RelationDescriptor	A expression field descriptor.

GetSimplePropertyDescriptor()

Gets the property descriptor this descriptor holds. If this field descriptor is a wrapper object for a property (IsComplexPropertyField) in the main table, the method will return NULL.

Declaration

public PropertyDescriptor GetSimplePropertyDescriptor()

Returns

Type	Description
System.ComponentModel.PropertyDescriptor	A property descriptor.

GetUnboundFieldDescriptor()

Gets the unbound field descriptor this descriptor holds. If this field descriptor is not a wrapper object for a unbound field, the method will return NULL.

Declaration

public FieldDescriptor GetUnboundFieldDescriptor()

Returns

Type	Description
FieldDescriptor	An expression field descriptor.

GetValue(Record)

Retrieves the value for this field from the underlying record.

Declaration

public virtual object GetValue(Record record)

Parameters

Type	Name	Description
Record	record	The record with data for this field.

Returns

Type	Description
System.Object	The value from the underlying record.

GetValueFromDataRow(Object)

Retrieves the value for this field from the underlying record.

Declaration

public object GetValueFromDataRow(object data)

Parameters

Type	Name	Description
System.Object	data	The DataRow with data for this field.

Returns

Type	Description
System.Object	The value from the underlying record.

InitializeFrom(FieldDescriptor)

Initializes this object and copies properties from another object. PropertyChanging and PropertyChanged events are raised for every property that is modified. If both objects are equal, no events are raised.

Declaration

public virtual void InitializeFrom(FieldDescriptor other)

Parameters

Type	Name	Description
FieldDescriptor	other	The source object.

IsComplexPropertyField()

Determines if this field descriptor is a wrapper object for a nested property inside a complex object. If so, the method will return NULL.

Declaration

public bool IsComplexPropertyField()

Returns

Type	Description
System.Boolean	True if this is a complex property field; False otherwise.

IsDynamicPropertyField()

Determines if this field descriptor is a wrapper object for a dynamic property in the main table (and not a nested property inside a complex object).

Declaration

public bool IsDynamicPropertyField()

Returns

Type	Description
System.Boolean	True if it is a property field; False otherwise.

IsExpressionField()

Determines if this field descriptor is a wrapper object for an expression field.

Declaration

public bool IsExpressionField()

Returns

Type	Description
System.Boolean	True if it is an expression field; False otherwise.

IsForeignKeyField()

Determines if this field descriptor is a foreign key field (and therefore changes to the field will affect other fields in the record).

Declaration

public bool IsForeignKeyField()

Returns

Type	Description
System.Boolean	True if it is a foreign key field; False otherwise.

IsObjectReferenceField()

Determines if this field descriptor is an object reference field.

Declaration

public bool IsObjectReferenceField()

Returns

Type	Description
System.Boolean	True if it is an object reference field; False otherwise.

IsPropertyField()

Determines if this field descriptor is a wrapper object for a property in the main table (and not a nested property inside a complex object).

Declaration

public bool IsPropertyField()

Returns

Type	Description
System.Boolean	True if it is a property field; False otherwise.

IsRelatedField()

Gets a related field descriptor of a related table that this descriptor holds. If this field descriptor is not a wrapper object for a field in a related table, the method will return NULL.

Declaration

public bool IsRelatedField()

Returns

Type	Description
System.Boolean	True if it is a related field; False otherwise.

IsUnboundField()

Determines if this field descriptor is an unbound field (no mapping name to an underlying property of the underlying datasource given).

Declaration

public bool IsUnboundField()

Returns

Type	Description
System.Boolean	True if it is an unbound field; False otherwise.

OnPropertyChanged(DescriptorPropertyChangedEventArgs)

Raises the PropertyChanged event.

Declaration

protected virtual void OnPropertyChanged(DescriptorPropertyChangedEventArgs e)

Parameters

Type	Name	Description
DescriptorPropertyChangedEventArgs	e	A DescriptorPropertyChangedEventArgs that contains the event data.

OnPropertyChanging(DescriptorPropertyChangedEventArgs)

Raises the PropertyChanging event.

Declaration

protected virtual void OnPropertyChanging(DescriptorPropertyChangedEventArgs e)

Parameters

Type	Name	Description
DescriptorPropertyChangedEventArgs	e	A DescriptorPropertyChangedEventArgs that contains the event data.

ResetAllowTrimEnd()

Resets the AllowTrimEnd property to False.

Declaration

public void ResetAllowTrimEnd()

ResetDefaultValue()

Resets the default value to empty.

Declaration

public void ResetDefaultValue()

ResetFieldPropertyType()

Resets the FieldPropertyType property.

Declaration

public void ResetFieldPropertyType()

ResetForceImmediateSaveValue()

Resets the ForceImmediateSaveValue property to False.

Declaration

public void ResetForceImmediateSaveValue()

ResetHide()

Resets the Hide property to False.

Declaration

public void ResetHide()

ResetName()

Resets the field's name.

Declaration

public void ResetName()

ResetReadOnly()

Resets the Read-only to False.

Declaration

public void ResetReadOnly()

ResetReferencedFields()

Resets the ReferencedFields property to False.

Declaration

public void ResetReferencedFields()

SetValue(Record, Object)

Saves the value into the underlying data source. If the field is an unbound field, a SaveValue event is raised.

Declaration

public void SetValue(Record record, object value)

Parameters

Type	Name	Description
Record	record	The record
System.Object	value	The new value.

SetValue(Record, Object, Boolean)

Saves the value into the underlying data source. If the field is an unbound field, a SaveValue event is raised.

Declaration

public virtual void SetValue(Record record, object value, bool forceListChanged)

Parameters

Type	Name	Description
Record	record	The record.
System.Object	value	The new value.
System.Boolean	forceListChanged	Specifies if a ListChanged event should be raised.

ShouldSerializeAllowTrimEnd()

Determines if the AllowTrimEnd state of the field was modified.

Declaration

public bool ShouldSerializeAllowTrimEnd()

Returns

Type	Description
System.Boolean	True if the state was modified; False otherwise.

ShouldSerializeDefaultValue()

Determines whether the default value is empty.

Declaration

public bool ShouldSerializeDefaultValue()

Returns

Type	Description
System.Boolean	True if the default value is not empty; False otherwise.

ShouldSerializeFieldPropertyType()

Determines if the FieldPropertyType of the field was modified.

Declaration

public bool ShouldSerializeFieldPropertyType()

Returns

Type	Description
System.Boolean	True if the content were modified; False otherwise.

ShouldSerializeForceImmediateSaveValue()

Determines if the ForceImmediateSaveValue state of the field was modified.

Declaration

public bool ShouldSerializeForceImmediateSaveValue()

Returns

Type	Description
System.Boolean	True if the content were modified; False otherwise.

ShouldSerializeHide()

Determines if the Hide state of the field was modified.

Declaration

public bool ShouldSerializeHide()

Returns

Type	Description
System.Boolean	True if the content were modified; False otherwise.

ShouldSerializeName()

Determines if the field's name was modified.

Declaration

public bool ShouldSerializeName()

Returns

Type	Description
System.Boolean	True if name is modified.

ShouldSerializeReadOnly()

Determines if the Read-only state of the field was modified.

Declaration

public bool ShouldSerializeReadOnly()

Returns

Type	Description
System.Boolean	True if the content were modified; False otherwise.

ShouldSerializeReferencedFields()

Determines if the ReferencedFields state of the field was modified.

Declaration

public virtual bool ShouldSerializeReferencedFields()

Returns

Type	Description
System.Boolean	True if the content were modified; False otherwise.

ToString()

Returns string representation of the descriptor.

Declaration

public override string ToString()

Returns

Type	Description
System.String	String representation of the current object.

Overrides

DescriptorBase.ToString()

Events

PropertyChanged

Occurs when a property is changed.

Declaration

public event DescriptorPropertyChangedEventHandler PropertyChanged

Event Type

Type	Description
DescriptorPropertyChangedEventHandler

PropertyChanging

Occurs before a property is changed.

Declaration

public event DescriptorPropertyChangedEventHandler PropertyChanging

Event Type

Type	Description
DescriptorPropertyChangedEventHandler

Explicit Interface Implementations

IStandardValuesProvider.GetStandardValues(PropertyDescriptor)

Returns an array of standard values used by StandardValuesCollectionConverter.

Declaration

ICollection IStandardValuesProvider.GetStandardValues(PropertyDescriptor pd)

Parameters

Type	Name	Description
System.ComponentModel.PropertyDescriptor	pd	The context.PropertyDescriptor of a TypeConverter.GetStandardValues method.

Returns

Type	Description
System.Collections.ICollection	An array of standard values used by StandardValuesCollectionConverter.

ICloneable.Clone()

Creates a copy of descriptor.

Declaration

object ICloneable.Clone()

Returns

Type	Description
System.Object	A copy of the descriptor.

Implements

System.ComponentModel.ICustomTypeDescriptor

System.IDisposable

System.ICloneable

IStandardValuesProvider