DataParameter Class
Definition
Important
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Represents a data parameter that is derived from a data source command, or that is passed with a command to a data source.
public ref class DataParameter abstractpublic abstract class DataParametertype DataParameter = classPublic MustInherit Class DataParameter- Inheritance
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DataParameter
- Derived
Constructors
| DataParameter() |
Class constructor. Initializes a nonparameterized instance of the DataParameter class. |
| DataParameter(Boolean) |
Class constructor. Initializes a parameterized instance of the DataParameter class, along with an indication whether the instance was derived using the DeriveParameters(String, Int32, Int32) method. |
Properties
| DefaultPrecision |
Retrieves a byte value specifying the default precision for the current parameter type. |
| DefaultScale |
Retrieves a byte value specifying the default scale for the current parameter type. |
| DefaultSize |
Retrieves and integer value specifying the default size for the current parameter type. |
| Direction |
Retrieves or sets a DataParameterDirection object specifying the direction of the parameter. |
| IsDerived |
Retrieves a Boolean value that indicates whether this parameter was derived from the data source. |
| IsFixedPrecision |
Retrieves a Boolean value indicating whether the precision for the current parameter type is fixed. |
| IsFixedScale |
Retrieves a Boolean value indicating whether the scale for the current parameter type is fixed. |
| IsFixedSize |
Retrieves a Boolean value indicating whether the size for the current parameter type is fixed. |
| IsNullable |
Retrieves a Boolean value indicating whether this parameter can have a null value. |
| IsOptional |
Retrieves a Boolean value indicating whether this parameter is optional, in cases where this parameter is a derived parameter. |
| Name |
Retrieves or sets the string literal name of the parameter. |
| Precision |
Retrieves or sets a byte value specifying the precision of the parameter. |
| Scale |
Retrieves or sets a byte value specifying the scale of the parameter. |
| Size |
Retrieves or sets an integer value specifying the size of the parameter. |
| Type |
Retrieves or sets the data-source-specific type of the parameter. |
| Value |
Retrieves or sets the value of the parameter. |
Methods
| GetDirectionImpl() |
Retrieves the parameter direction. |
| GetIsNullableImpl() |
Retrieves a Boolean value indicating whether or not this parameter can be null. |
| GetIsOptionalImpl() |
Retrieves a Boolean value indicating whether this parameter is optional. |
| GetNameImpl() |
Retrieves the name of the parameter. |
| GetPrecisionImpl() |
Retrieves a byte value specifying the precision of the parameter. |
| GetScaleImpl() |
Retrieves a byte value specifying the scale of the parameter. |
| GetSizeImpl() |
Retrieves an integer value specifying the size of the parameter. |
| GetTypeFrom(Object) |
Infers the data-source-specific parameter type from a parameter value. |
| GetTypeImpl() |
Retrieves the data-source-specific type of the parameter. |
| GetValueImpl() |
Retrieves the value of a specified parameter. |
| IsSupportedDirection(DataParameterDirection) |
Retrieves a Boolean value indicating whether the specified parameter direction is supported. |
| IsValidType(String) |
Retrieves a Boolean value indicating whether the specified data-source-specific type is a valid type. |
| OnDirectionChanged() |
Called when the Direction property is changed to signal a change in the parameter direction. |
| OnDirectionChanging(DataParameterDirection) |
Called when the Direction property is about to change. |
| OnNameChanged() |
Called when the Name property has changed. |
| OnNameChanging(String) |
Called when the Name property is about to change. |
| OnPrecisionChanged() |
Called when the Precision property has changed. |
| OnPrecisionChanging(Byte) |
Called when the Precision property is about to change. |
| OnScaleChanged() |
Called when the Scale property has changed. |
| OnScaleChanging(Byte) |
Called when the Scale property is about to change. |
| OnSizeChanged() |
Called when the Size property has changed. |
| OnSizeChanging(Int32) |
Called when the Size property is about to change. |
| OnTypeChanged() |
Called when the Type property has changed. |
| OnTypeChanging(String) |
Called when the Type property is about to change. |
| OnValueChanged() |
Called when the Value property has changed. |
| OnValueChanging(Object) |
Called when the Value property is about to change. |
| Parse(String) |
Disassembles a parameter value in a string format and converts the value to the correct type. |
| SetDirectionImpl(DataParameterDirection) |
Sets the direction of the parameter using the DataParameterDirection enumeration. |
| SetNameImpl(String) |
Sets the name of the parameter. |
| SetPrecisionImpl(Byte) |
Sets a byte value specifying the precision of the parameter. |
| SetScaleImpl(Byte) |
Sets a byte value specifying the scale of the parameter. |
| SetSizeImpl(Int32) |
Sets an integer value specifying the size of this parameter. |
| SetTypeImpl(String) |
Sets the data type of this parameter. |
| SetValueImpl(Object) |
Sets the value of this parameter. |
| ToString() |
Retrieves a string representation of the value of this parameter. |
| TryConvertValue(Object, String) |
Attempts to convert the specified value to the specified type. |