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     private BindingManagerBase bm1 = null;
private BindingManagerBase bm2 = null;

private void DataScanInForm2_Load(object sender, EventArgs e)
        {
string sqlString1 = "select * from 客戶";
string sqlString2 = "select * from 訂單";
string[] sqlStrings = new string[] { sqlString1, sqlString2 };
string[] tableNames = new string[] { "客戶", "訂單" };

            DataSet ds = new DataSet();
            ds = Rabbit.DBUtility.DBHelperOLEDB.Query(sqlStrings, tableNames);

            DataColumn parentColumn = new DataColumn();
            DataColumn childColumn = new DataColumn();
            parentColumn = ds.Tables["客戶"].Columns["ID"];
            childColumn = ds.Tables["訂單"].Columns["客戶 ID"];

            DataRelation relation = new DataRelation("每一位客戶的訂單", parentColumn, childColumn);
            ds.Relations.Add(relation);

//綁定
            txtCID.DataBindings.Add("text", ds, "客戶.ID");
            txtCCompany.DataBindings.Add("text", ds, "客戶.公司");
            txtCFamliyName.DataBindings.Add("text", ds, "客戶.姓氏");
            txtCHomepage.DataBindings.Add("text", ds, "客戶.主頁");

            txtOID.DataBindings.Add("text", ds, "客戶.每一位客戶的訂單.訂單 ID");
            dtpODate.DataBindings.Add("value", ds, "客戶.每一位客戶的訂單.訂單日期");
            txtOName.DataBindings.Add("text", ds, "客戶.每一位客戶的訂單.發貨名稱");
            txtOCity.DataBindings.Add("text", ds, "客戶.每一位客戶的訂單.發貨城市");
            nudOCost.DataBindings.Add("value", ds, "客戶.每一位客戶的訂單.運費");

            Binding bTax = new Binding("text", ds, "客戶.每一位客戶的訂單.稅款");
            bTax.Format += new ConvertEventHandler(bTax_Format);txtOTax.DataBindings.Add(bTax);


            bm1 = this.BindingContext[ds, "客戶"];
            bm2 = this.BindingContext[ds, "客戶.每一位客戶的訂單"];
            bm1.PositionChanged += new EventHandler(bm1_PositionChanged);
            bm2.PositionChanged += new EventHandler(bm2_PositionChanged);
this.bm1_PositionChanged(null, new EventArgs());
this.bm2_PositionChanged(null, new EventArgs());
        }

private void bTax_Format(object sender, ConvertEventArgs e)
        {
            e.Value = string.Format("{0:c3}", (decimal)e.Value);
        }

private void bm1_PositionChanged(object sender, EventArgs e)
        {
            textBox1.Text = string.Format("當前位置：{0}，共計：{1}", bm1.Position + 1, bm1.Count);
this.bm2_PositionChanged(null, new EventArgs());
        }

private void bm2_PositionChanged(object sender, EventArgs e)
        {
            //當bm1.Position改變時，先執行bm2.Position的PositionChanged事件，
            //再執行bm1.Position的PositionChanged事件。而在執行bm2.Position的
            //PositionChanged事件之前，bm2.Position已經指向了bm1.Position所指向
            //記錄的第一個子記錄，即bm2.Position=0；如果沒有子記錄，則bm2.Position=-1
            textBox2.Text = string.Format("當前位置：{0}，共計：{1}", bm2.Position + 1, bm2.Count);
        }

private void btnCBack_Click(object sender, EventArgs e)
        {
if (bm1.Position > 0)
            {
                bm1.Position -= 1;
            }
        }

private void btnCNext_Click(object sender, EventArgs e)
        {
if (bm1.Position < bm1.Count - 1)
            {
                bm1.Position += 1;
            }
        }

private void btnCFirst_Click(object sender, EventArgs e)
        {
            bm1.Position = 0;
        }

private void btnCLast_Click(object sender, EventArgs e)
        {
            bm1.Position = bm1.Count - 1;
        }

private void btnOBack_Click(object sender, EventArgs e)
        {
if (bm2.Position > 0)
            {
                bm2.Position -= 1;
            }
        }

private void btnONext_Click(object sender, EventArgs e)
        {
if (bm2.Position < bm2.Count - 1)
　　　　　　　{

　　　　　　　　　　//當下一記錄的數據無法通過與之綁定的控件的有效性檢驗時，//將會導致指向下一記錄失敗，即下式計算失敗，bm2.Position保持不變//例如，圖中有一個顯示運費的NumericUpDown控件，如果下一記錄的運費//為300，而該控件的MaxValue屬性值為200，則將會導致指向失敗

                bm2.Position += 1;
            }
        }

private void btnOFirst_Click(object sender, EventArgs e)
        {
            bm2.Position = 0;
        }

private void btnOLast_Click(object sender, EventArgs e)
        {
            bm2.Position = bm2.Count - 1;
        }

?

轉載于:https://www.cnblogs.com/2008freestyle/archive/2012/03/19/2406063.html

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