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Improvements around DBNull.Value for DataRowExtensions #9080

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Jun 23, 2023
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Improvements around DBNull.Value for DataRowExtensions #9080

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30 changes: 15 additions & 15 deletions xml/System.Data/DataRowExtensions.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -107,9 +107,9 @@
<format type="text/markdown"><![CDATA[

## Remarks
The <xref:System.Data.DataSet> class represents **null** values with the <xref:System.DBNull.Value> instance of the <xref:System.DBNull> class. A Language-Integrated Query (LINQ) expression that accessed a column with a **null** value would generate a <xref:System.InvalidCastException> at run time. Additionally, <xref:System.Data.DataSet> does not support nullable types. The <xref:System.Data.DataRowExtensions.Field%2A> method provides support for accessing columns as nullable types. If the underlying value in the <xref:System.Data.DataSet> is <xref:System.DBNull.Value>, the returned nullable type will have a value of **null**.
The <xref:System.Data.DataSet> class represents **null** values with the <xref:System.DBNull.Value> instance of the <xref:System.DBNull> class. A Language-Integrated Query (LINQ) expression that accessed a column with a **null** value would generate a <xref:System.InvalidCastException> at run time. Additionally, <xref:System.Data.DataSet> and <xref:System.Data.DataTable> do not support nullable types. The <xref:System.Data.DataRowExtensions.Field%2A> method provides support for accessing columns as nullable types. If the underlying value in the <xref:System.Data.DataSet> is <xref:System.DBNull.Value?displayProperty=nameWithType>, the returned nullable type will have a value of **null**.

If the value of the specified <xref:System.Data.DataColumn> is <xref:System.DBNull.Value> and `T` is a reference type or nullable type, the return type will be **null**. The <xref:System.Data.DataRowExtensions.Field%2A> method will not return <xref:System.DBNull.Value>.
If the value of the specified <xref:System.Data.DataColumn> is <xref:System.DBNull.Value?displayProperty=nameWithType> and `T` is a reference type or nullable type, the return type will be **null**. The <xref:System.Data.DataRowExtensions.Field%2A> method will not return <xref:System.DBNull.Value?displayProperty=nameWithType>.

The <xref:System.Data.DataRowExtensions.Field%2A> method does not perform type conversions. If type conversion is required, you should first obtain the column value by using the <xref:System.Data.DataRowExtensions.Field%2A> method. The column value should then be converted to another type.

Expand Down Expand Up @@ -167,9 +167,9 @@
<format type="text/markdown"><![CDATA[

## Remarks
The <xref:System.Data.DataSet> class represents **null** values with the <xref:System.DBNull.Value> instance of the <xref:System.DBNull> class. A Language-Integrated Query (LINQ) expression that accessed a column with a **null** value would generate a <xref:System.InvalidCastException> at run time. Additionally, <xref:System.Data.DataSet> doesn't support nullable types. The <xref:System.Data.DataRowExtensions.Field%2A> method provides support for accessing columns as nullable types. If the underlying value in the <xref:System.Data.DataSet> is <xref:System.DBNull.Value>, the returned nullable type will have a value of **null**.
The <xref:System.Data.DataSet> class represents **null** values with the <xref:System.DBNull.Value> instance of the <xref:System.DBNull> class. A Language-Integrated Query (LINQ) expression that accessed a column with a **null** value would generate a <xref:System.InvalidCastException> at run time. Additionally, <xref:System.Data.DataSet> doesn't support nullable types. The <xref:System.Data.DataRowExtensions.Field%2A> method provides support for accessing columns as nullable types. If the underlying value in the <xref:System.Data.DataSet> is <xref:System.DBNull.Value?displayProperty=nameWithType>, the returned nullable type will have a value of **null**.

If the value of the specified <xref:System.Data.DataColumn> is **null** and `T` is a reference type or nullable type, then the return type will be **null**. The <xref:System.Data.DataRowExtensions.Field%2A> method will not return <xref:System.DBNull.Value>.
If the value of the specified <xref:System.Data.DataColumn> is **null** and `T` is a reference type or nullable type, then the return type will be **null**. The <xref:System.Data.DataRowExtensions.Field%2A> method will not return <xref:System.DBNull.Value?displayProperty=nameWithType>.

The <xref:System.Data.DataRowExtensions.Field%2A> method does not perform type conversions. If type conversion is required, you should first obtain the column value by using the <xref:System.Data.DataRowExtensions.Field%2A> method. The column value should then be converted to another type.

Expand Down Expand Up @@ -227,9 +227,9 @@
<format type="text/markdown"><![CDATA[

## Remarks
The <xref:System.Data.DataSet> class represents **null** values with the <xref:System.DBNull.Value> instance of the <xref:System.DBNull> class. A Language-Integrated Query (LINQ) expression that accessed a column with a **null** value would generate a <xref:System.InvalidCastException> at run time. Additionally, <xref:System.Data.DataSet> does not support nullable types. The <xref:System.Data.DataRowExtensions.Field%2A> method provides support for accessing columns as nullable types. If the underlying value in the <xref:System.Data.DataSet> is <xref:System.DBNull.Value>, the returned nullable type will have a value of **null**.
The <xref:System.Data.DataSet> class represents **null** values with the <xref:System.DBNull.Value> instance of the <xref:System.DBNull> class. A Language-Integrated Query (LINQ) expression that accessed a column with a **null** value would generate a <xref:System.InvalidCastException> at run time. Additionally, <xref:System.Data.DataSet> and <xref:System.Data.DataTable> do not support nullable types. The <xref:System.Data.DataRowExtensions.Field%2A> method provides support for accessing columns as nullable types. If the underlying value in the <xref:System.Data.DataSet> is <xref:System.DBNull.Value?displayProperty=nameWithType>, the returned nullable type will have a value of **null**.

If the value of the specified <xref:System.Data.DataColumn> is **null** and `T` is a reference type or nullable type, the return type will be **null**. The <xref:System.Data.DataRowExtensions.Field%2A> method will not return <xref:System.DBNull.Value>.
If the value of the specified <xref:System.Data.DataColumn> is **null** and `T` is a reference type or nullable type, the return type will be **null**. The <xref:System.Data.DataRowExtensions.Field%2A> method will not return <xref:System.DBNull.Value?displayProperty=nameWithType>.

The <xref:System.Data.DataRowExtensions.Field%2A> method does not perform type conversions. If type conversion is required, you should first obtain the column value by using the <xref:System.Data.DataRowExtensions.Field%2A> method. The column value should then be converted to another type.

Expand Down Expand Up @@ -289,9 +289,9 @@
<format type="text/markdown"><![CDATA[

## Remarks
The <xref:System.Data.DataSet> class represents **null** values with the <xref:System.DBNull.Value> instance of the <xref:System.DBNull> class. A Language-Integrated Query (LINQ) expression that accessed a column with a **null** value would generate a <xref:System.InvalidCastException> at run time. Additionally, <xref:System.Data.DataSet> doesn't support nullable types. The <xref:System.Data.DataRowExtensions.Field%2A> method provides support for accessing columns as nullable types. If the underlying value in the <xref:System.Data.DataSet> is <xref:System.DBNull.Value>, the returned nullable type will have a value of **null**.
The <xref:System.Data.DataSet> class represents **null** values with the <xref:System.DBNull.Value> instance of the <xref:System.DBNull> class. A Language-Integrated Query (LINQ) expression that accessed a column with a **null** value would generate a <xref:System.InvalidCastException> at run time. Additionally, <xref:System.Data.DataSet> doesn't support nullable types. The <xref:System.Data.DataRowExtensions.Field%2A> method provides support for accessing columns as nullable types. If the underlying value in the <xref:System.Data.DataSet> is <xref:System.DBNull.Value?displayProperty=nameWithType>, the returned nullable type will have a value of **null**.

If the value of the specified <xref:System.Data.DataColumn> is null and `T` is a reference type or nullable type, then the return type will be **null**. The <xref:System.Data.DataRowExtensions.Field%2A> method will not return <xref:System.DBNull.Value>.
If the value of the specified <xref:System.Data.DataColumn> is null and `T` is a reference type or nullable type, then the return type will be **null**. The <xref:System.Data.DataRowExtensions.Field%2A> method will not return <xref:System.DBNull.Value?displayProperty=nameWithType>.

The <xref:System.Data.DataRowExtensions.Field%2A> method does not perform type conversions. If type conversion is required, you should first obtain the column value by using the <xref:System.Data.DataRowExtensions.Field%2A> method. The column value should then be converted to another type.

Expand Down Expand Up @@ -351,9 +351,9 @@
<format type="text/markdown"><![CDATA[

## Remarks
The <xref:System.Data.DataSet> class represents **null** values with the <xref:System.DBNull.Value> instance of the <xref:System.DBNull> class. A Language-Integrated Query (LINQ) expression that accessed a column with a **null** value would generate a <xref:System.InvalidCastException> at run time. Additionally, <xref:System.Data.DataSet> doesn't support nullable types. The <xref:System.Data.DataRowExtensions.Field%2A> method provides support for accessing columns as nullable types. If the underlying value in the <xref:System.Data.DataSet> is <xref:System.DBNull.Value>, the returned nullable type will have a value of **null**.
The <xref:System.Data.DataSet> class represents **null** values with the <xref:System.DBNull.Value> instance of the <xref:System.DBNull> class. A Language-Integrated Query (LINQ) expression that accessed a column with a **null** value would generate a <xref:System.InvalidCastException> at run time. Additionally, <xref:System.Data.DataSet> doesn't support nullable types. The <xref:System.Data.DataRowExtensions.Field%2A> method provides support for accessing columns as nullable types. If the underlying value in the <xref:System.Data.DataSet> is <xref:System.DBNull.Value?displayProperty=nameWithType>, the returned nullable type will have a value of **null**.

If the value of the specified <xref:System.Data.DataColumn> is null and `T` is a reference type or nullable type, then the return type will be **null**. The <xref:System.Data.DataRowExtensions.Field%2A> method will not return <xref:System.DBNull.Value>.
If the value of the specified <xref:System.Data.DataColumn> is null and `T` is a reference type or nullable type, then the return type will be **null**. The <xref:System.Data.DataRowExtensions.Field%2A> method will not return <xref:System.DBNull.Value?displayProperty=nameWithType>.

The <xref:System.Data.DataRowExtensions.Field%2A> method does not perform type conversions. If type conversion is required, you should first obtain the column value by using the <xref:System.Data.DataRowExtensions.Field%2A> method. The column value should then be converted to another type.

Expand Down Expand Up @@ -413,9 +413,9 @@
<format type="text/markdown"><![CDATA[

## Remarks
The <xref:System.Data.DataSet> class represents **null** values with the <xref:System.DBNull.Value> instance of the <xref:System.DBNull> class. A Language-Integrated Query (LINQ) expression that accessed a column with a **null** value would generate a <xref:System.InvalidCastException> at run time. Additionally, <xref:System.Data.DataSet> doesn't support nullable types. The <xref:System.Data.DataRowExtensions.Field%2A> method provides support for accessing columns as nullable types. If the underlying value in the <xref:System.Data.DataSet> is <xref:System.DBNull.Value>, the returned nullable type will have a value of **null**.
The <xref:System.Data.DataSet> class represents **null** values with the <xref:System.DBNull.Value> instance of the <xref:System.DBNull> class. A Language-Integrated Query (LINQ) expression that accessed a column with a **null** value would generate a <xref:System.InvalidCastException> at run time. Additionally, <xref:System.Data.DataSet> doesn't support nullable types. The <xref:System.Data.DataRowExtensions.Field%2A> method provides support for accessing columns as nullable types. If the underlying value in the <xref:System.Data.DataSet> is <xref:System.DBNull.Value?displayProperty=nameWithType>, the returned nullable type will have a value of **null**.

If the value of the specified <xref:System.Data.DataColumn> is null and `T` is a reference type or nullable type, then the return type will be **null**. The <xref:System.Data.DataRowExtensions.Field%2A> method will not return <xref:System.DBNull.Value>.
If the value of the specified <xref:System.Data.DataColumn> is null and `T` is a reference type or nullable type, then the return type will be **null**. The <xref:System.Data.DataRowExtensions.Field%2A> method will not return <xref:System.DBNull.Value?displayProperty=nameWithType>.

The <xref:System.Data.DataRowExtensions.Field%2A> method does not perform type conversions. If type conversion is required, you should first obtain the column value by using the <xref:System.Data.DataRowExtensions.Field%2A> method. The column value should then be converted to another type.

Expand Down Expand Up @@ -483,7 +483,7 @@
<format type="text/markdown"><![CDATA[

## Remarks
If `value` is **null**, the <xref:System.Data.DataRowExtensions.SetField%2A> method converts the **null** value to <xref:System.DBNull.Value> in the underlying <xref:System.Data.DataColumn>.
If `value` is **null**, the <xref:System.Data.DataRowExtensions.SetField%2A> method converts the **null** value to <xref:System.DBNull.Value?displayProperty=nameWithType> in the underlying <xref:System.Data.DataColumn>.

The <xref:System.Data.DataRowExtensions.SetField%2A> method does not perform any type conversions. This does not mean, however, that a type conversion will not occur. The <xref:System.Data.DataRowExtensions.SetField%2A> method exposes the ADO.NET 2.0 behavior of the <xref:System.Data.DataRow> class. A type conversion could be performed by the <xref:System.Data.DataRow> object and the converted value would then be saved to the row.

Expand Down Expand Up @@ -545,7 +545,7 @@
<format type="text/markdown"><![CDATA[

## Remarks
If `value` is **null**, the <xref:System.Data.DataRowExtensions.SetField%2A> method converts the **null** value to <xref:System.DBNull.Value> in the underlying <xref:System.Data.DataColumn>.
If `value` is **null**, the <xref:System.Data.DataRowExtensions.SetField%2A> method converts the **null** value to <xref:System.DBNull.Value?displayProperty=nameWithType> in the underlying <xref:System.Data.DataColumn>.

The <xref:System.Data.DataRowExtensions.SetField%2A> method does not perform any type conversions. This does not mean, however, that a type conversion will not occur. The <xref:System.Data.DataRowExtensions.SetField%2A> method exposes the ADO.NET 2.0 behavior of the <xref:System.Data.DataRow> class. A type conversion could be performed by the <xref:System.Data.DataRow> object and the converted value would then be saved to the row.

Expand Down Expand Up @@ -606,7 +606,7 @@
<format type="text/markdown"><![CDATA[

## Remarks
If `value` is **null**, the <xref:System.Data.DataRowExtensions.SetField%2A> method converts the **null** value to <xref:System.DBNull.Value> in the underlying <xref:System.Data.DataColumn>.
If `value` is **null**, the <xref:System.Data.DataRowExtensions.SetField%2A> method converts the **null** value to <xref:System.DBNull.Value?displayProperty=nameWithType> in the underlying <xref:System.Data.DataColumn>.

The <xref:System.Data.DataRowExtensions.SetField%2A> method does not perform any type conversions. This does not mean, however, that a type conversion will not occur. The <xref:System.Data.DataRowExtensions.SetField%2A> method exposes the ADO.NET 2.0 behavior of the <xref:System.Data.DataRow> class. A type conversion could be performed by the <xref:System.Data.DataRow> object and the converted value would then be saved to the row.

Expand Down