C# DataRow.ItemArray 属性【C#.Net教程】,C#,DataRow.ItemArray

DataRow.ItemArray 属性
经由过程一个数组来猎取或设置此行的一切值。
定名空间:System.Data

顺序集:System.Data（在 system.data.dll 中）

代码示例：

private void CreateRowsWithItemArray()
{
    // Make a DataTable using the function below.
    DataTable dt = MakeTableWithAutoIncrement();
    DataRow relation;
    // Declare the array variable.
    object [] rowArray = new object[2];
    // Create 10 new rows and add to DataRowCollection.
    for(int i = 0; i <10; i++)
    {
        rowArray[0]=null;
        rowArray[1]= "item " + i;
        relation = dt.NewRow();
        relation.ItemArray = rowArray;
        dt.Rows.Add(relation);
    }
    PrintTable(dt);
}
 
private DataTable MakeTableWithAutoIncrement()
{
    // Make a table with one AutoIncrement column.
    DataTable table = new DataTable("table");
    DataColumn idColumn = new DataColumn("id", 
        Type.GetType("System.Int32"));
    idColumn.AutoIncrement = true;
    idColumn.AutoIncrementSeed = 10;
    table.Columns.Add(idColumn);

    DataColumn firstNameColumn = new DataColumn("Item", 
        Type.GetType("System.String"));
    table.Columns.Add(firstNameColumn);
    return table;
}
 
private void PrintTable(DataTable table)
{
    foreach(DataRow row in table.Rows)
    {
        foreach(DataColumn column in table.Columns)
        {
            Console.WriteLine(row[column]);
        }
    }
}

非常：

非常范例	前提
ArgumentException	数组大于表中的列数。
InvalidCastException	数组中的值与其响应的 DataColumn 中的 DataType 不婚配。
ConstraintException	编辑破坏了束缚。
ReadOnlyException	编辑试图变动只读列的值。
NoNullAllowedException	编辑试图将空值放在 DataColumn 对象的 AllowDBNull 为 false 的列中。
DeletedRowInaccessibleException	该行已被删除。

DataRow.ItemArray 属性源代码完成：

public object[] ItemArray
{
	get
	{
		int defaultRecord = this.GetDefaultRecord();
		object[] array = new object[this._columns.Count];
		for (int i = 0; i < array.Length; i++)
		{
			DataColumn dataColumn = this._columns[i];
			array[i] = dataColumn[defaultRecord];
		}
		return array;
	}
	set
	{
		if (value == null)
		{
			throw ExceptionBuilder.ArgumentNull("ItemArray");
		}
		if (this._columns.Count < value.Length)
		{
			throw ExceptionBuilder.ValueArrayLength();
		}
		DataColumnChangeEventArgs dataColumnChangeEventArgs = null;
		if (this._table.NeedColumnChangeEvents)
		{
			dataColumnChangeEventArgs = new DataColumnChangeEventArgs(this);
		}
		bool flag = this.BeginEditInternal();
		for (int i = 0; i < value.Length; i++)
		{
			if (value[i] != null)
			{
				DataColumn dataColumn = this._columns[i];
				if (-1L != this.rowID && dataColumn.ReadOnly)
				{
					throw ExceptionBuilder.ReadOnly(dataColumn.ColumnName);
				}
				if (dataColumnChangeEventArgs != null)
				{
					dataColumnChangeEventArgs.InitializeColumnChangeEvent(dataColumn, value[i]);
					this._table.OnColumnChanging(dataColumnChangeEventArgs);
				}
				if (dataColumn.Table != this._table)
				{
					throw ExceptionBuilder.ColumnNotInTheTable(dataColumn.ColumnName, this._table.TableName);
				}
				if (-1L != this.rowID && dataColumn.ReadOnly)
				{
					throw ExceptionBuilder.ReadOnly(dataColumn.ColumnName);
				}
				if (this.tempRecord == -1)
				{
					this.BeginEditInternal();
				}
				object obj = (dataColumnChangeEventArgs != null) ? dataColumnChangeEventArgs.ProposedValue : value[i];
				if (obj == null)
				{
					if (dataColumn.IsValueType)
					{
						throw ExceptionBuilder.CannotSetToNull(dataColumn);
					}
					obj = DBNull.Value;
				}
				try
				{
					int proposedRecordNo = this.GetProposedRecordNo();
					dataColumn[proposedRecordNo] = obj;
				}
				catch (Exception e)
				{
					if (ADP.IsCatchableOrSecurityExceptionType(e) && flag)
					{
						this.CancelEdit();
					}
					throw;
				}
				this.LastChangedColumn = dataColumn;
				if (dataColumnChangeEventArgs != null)
				{
					this._table.OnColumnChanged(dataColumnChangeEventArgs);
				}
			}
		}
		this.EndEdit();
	}
}

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