我不认为我们可以利用查找控制方法访问绑定字段。 AUTHOR_NAME 是数据字段的绑定使用费尔德你的FindControl不能访问它里面的名字，它不是控制。

I don't think we can access bound field using Find control method. author_name is the name of datafield inside the bound feild you can't access it using FindControl, it is not a control.

使用的e.RowIndex来获取更新的值。

Use the e.RowIndex to get the updated values.

public void gv_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
    string bookname = ((TextBox)(gv_table1.Rows[e.RowIndex].Cells[1].Controls[0])).Text;

                         // OR
    string bookname =(gv_table1.Rows[e.RowIndex].Cells[1].Controls[0] as TextBox).Text;
    gv_table1.EditIndex = -1;  // reset the edit index
    // Again Bind the gridview to show updated data
}

更新答案：

问题：
的问题是，你在每个岗位绑定你的GridView回

解决方案：

要测试它，我创建了一个GridView添加两个栏，我得到了旧的价值观念，如果我绑定在每次回发的GridView。为了避免它只是在添加 Page.IsPostBack 检查之前绑定的网格。

To test it,I create a gridview add two column, and I got old values if I bind gridview on each postback. To avoid from it just add the Page.IsPostBack check in your before binding the grid.

protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack) // If you not place this check then you will get the old values because GridView in Bind on every postback
    {
        BindGrid(); // Bind you grid here
    }
}

我的完整code：

// Aspx Code
<asp:GridView ID="GridView1" AutoGenerateColumns="false" runat="server" 
    AllowPaging="True" 
     onrowediting="GridView1_RowEditing" onrowupdating="GridView1_RowUpdating" onrowcancelingedit="GridView1_RowCancelingEdit" 
    >        
    <Columns>
        <asp:BoundField DataField="Name" HeaderText="Name" />
        <asp:BoundField DataField="City" HeaderText="Name" />
        <asp:CommandField ShowEditButton ="true" ShowCancelButton="true"  ShowDeleteButton="true" />
    </Columns>
</asp:GridView>

// Aspx Code Behind
protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack) // If you not place this check then you will get the old values because GridView in Bind on every postback
    {
        BindGrid();
    }
}
private void BindGrid() // function for binding gridview
{
    DataTable dt = new DataTable();
    dt.Columns.Add("Name");
    dt.Columns.Add("City");

    DataRow r = dt.NewRow();
    r[0] = "Name 1";
    r[1] = "City 1";

    DataRow r1 = dt.NewRow();
    r1[0] = "Name 2";
    r1[1] = "City 2";

    dt.Rows.Add(r);
    dt.Rows.Add(r1);

    GridView1.DataSource = dt;
    GridView1.DataBind();
}


protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
    GridView1.EditIndex = e.NewEditIndex; // setting new index
    BindGrid();
}


protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
    GridViewRow row = GridView1.Rows[e.RowIndex];
    string newvalue = ((TextBox)row.Cells[0].Controls[0]).Text;
     GridView1.EditIndex = -1; // Again reset
}

protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
    GridView1.EditIndex = -1; // reseting grid view
    BindGrid();
}