C# DataRow.ItemArray 属性

DataRow.ItemArray 属性
通过一个数组来获取或设置此行的所有值。
命名空间:System.Data

程序集: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]);
        }
    }
}

异常：

异常类型	条件
ArgumentException	数组大于表中的列数。
InvalidCastException	数组中的值与其相应的 DataColumn 中的 DataType 不匹配。
ConstraintException	编辑破坏了约束。
ReadOnlyException	编辑试图更改只读列的值。
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 属性源代码实现：

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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