A detailed explanation of C # Datarow.itemarray attributes

Datarow.itemarray Property

Gets or sets all the values of this row through an array.

Namespaces: System.Data

Assembly: System.Data (in system.data.dll)

code example:

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 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]); }  
    }  
}

Abnormal:

This paper url:http://www.bianceng.cn/programming/csharp/201410/45585.htm

Datarow.itemarray Property Source code implementation:

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.rea  
                DOnly (Datacolumn.columnname); } if (DataColumnChangeEventArgs!= null) {Datacolumnchangeevent  
                    Args.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; The catch (Exception e) {if (ADP). Iscatchableorsecurityexceptiontype (e) && flag) {this.  
                    CancelEdit ();  
                } throw; } this.Lastchangedcolumn = DataColumn; if (DataColumnChangeEventArgs!= null) {this._table.  
                Oncolumnchanged (DataColumnChangeEventArgs); }}} this.  
    EndEdit (); }  
}