注明：此文章是轉載而來，只是稍稍改了一點。。。

1、實現語言，c#，mysql,其中要引入mysq.dll

需要建立三個表----對應關系

2、Web.cofig

3、demo.cx文件:

private string conn = WebConfigurationManager.ConnectionStrings["Conn"].ConnectionString.ToString();

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

//綁定第一個下拉框

Dd1DataBind();

//顯示第一個下拉框對應的第二個下拉框的內容

Dd2DataBind();

//顯示第二個下拉框對應的第三個下拉框的內容

Dd3DataBind();

}

}

//當下拉框改變時，顯示相應的內容

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)

{

Dd2DataBind();

Dd3DataBind();

}

//當下拉框改變時，顯示相應的內容

protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)

{

Dd3DataBind();

}

//DropDownList1

public void Dd1DataBind()

{

string sqlStr = "Select TypeID,TypeName From a ";

FillDropList(sqlStr, DropDownList1);

}

//DropDownList2

public void Dd2DataBind()

{

int PreID = Convert.ToInt32(DropDownList1.SelectedValue);

string sqlStr1 = "Select ID,name From b Where TypeID=' " + PreID.ToString() + "'";

FillDropList(sqlStr1, DropDownList2);

}

//DropDownList3

public void Dd3DataBind()

{

int PreID = Convert.ToInt32(DropDownList2.SelectedValue);

string sqlStr2 = "Select IDcun,name From c Where ID=' " + PreID.ToString() + "'";

FillDropList(sqlStr2, DropDownList3);

}

//綁定方法

public void FillDropList(string SQLString, DropDownList drp)

{

MySqlConnection m_oMysqlConnection = new MySqlConnection(conn);

MySqlCommand cmd = new MySqlCommand(SQLString, m_oMysqlConnection);

MySqlDataAdapter sda = new MySqlDataAdapter(cmd);

DataSet ds = new DataSet();

sda.Fill(ds, "DropList");

drp.DataSource = ds.Tables["DropList"].DefaultView;

drp.DataTextField = ds.Tables["DropList"].Columns[1].ColumnName;

drp.DataValueField = ds.Tables["DropList"].Columns[0].ColumnName;

drp.DataBind();

}

4.demo.aspx

OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" OnTextChanged="DropDownList1_SelectedIndexChanged">

OnSelectedIndexChanged="DropDownList2_SelectedIndexChanged">

總結

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