无法将类型为“System.Web.UI.WebControls.Button”的对象强制转换为类型“System.Web.UI.WebControls.TextBox”

hunanchina 2007-01-16 05:07:38

无法将类型为“System.Web.UI.WebControls.Button”的对象强制转换为类型“System.Web.UI.WebControls.TextBox”

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切换为时间正序

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facebookdotcom 2008-12-20

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Click the link to solve your problem.Good luck!

jbirdbody 2008-06-05

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楼主是火星人!

yang2987 2008-05-20

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Cell是从零开始计算的，你第七个一定是Button吧？所以报错“无法强制转换”~！

hunanchina 2007-01-16

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cm.Parameters.Add(new SqlParameter("@id", SqlDbType.Int, 4));
cm.Parameters.Add(new SqlParameter("@sort", SqlDbType.VarChar, 50));
cm.Parameters.Add(new SqlParameter("@typename", SqlDbType.VarChar, 50));
cm.Parameters.Add(new SqlParameter("@wenti", SqlDbType.VarChar, 50));
cm.Parameters.Add(new SqlParameter("@wentilist", SqlDbType.VarChar, 50));
cm.Parameters.Add(new SqlParameter("@status", SqlDbType.VarChar, 50));
string colvalue = ((TextBox)e.Item.Cells[0].Controls[0]).Text;
cm.Parameters["@sort"].Value = colvalue;
colvalue = ((TextBox)e.Item.Cells[1].Controls[0]).Text;
cm.Parameters["@typename"].Value = colvalue;
colvalue = ((TextBox)e.Item.Cells[2].Controls[0]).Text;
cm.Parameters["@wenti"].Value = colvalue;
colvalue = ((TextBox)e.Item.Cells[3].Controls[0]).Text;
cm.Parameters["@wentilist"].Value = colvalue;
colvalue = ((TextBox)e.Item.Cells[6].Controls[0]).Text;//就是这行提示错误
cm.Parameters["@status"].Value = colvalue;

hunanchina 2007-01-16

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那要怎么办

suhongwei 2007-01-16

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确实不能转换成功.

vfan2010 2007-01-16

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呵呵。

孟子E章 2007-01-16

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是的。不能转换

系统源代码一、登录界面代码 using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Data.SqlClient; public partial class login : System.Web.UI.Page { protected void txtid_Click(object sender, EventArgs e) { txtid.Text = ""; txtpassword.Text = ""; } protected void Button1_Click(object sender, E

using System; using System.Collections; using System.Configuration; using System.Data; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.HtmlControls; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Xml.Linq; using System.Data.SqlClient; public partial class Register : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void Button1_Click(object sender, EventArgs e)

因为需要对GridView中HyperLinkField列和ButtonField列的取值，搜索了一下看到好多资料都是这样写的： string str = ((HyperLink)row.Cells[1].Controls[0]).Text; string str2 = ((Button)row.Cells[2].Controls[0]).Text; //注意红色部分可是我这样取的话会报：无法将类型为“System.Web.UI.WebControls.DataControlLinkButton”的对象强制转换为类型“System.Web.UI.WebControls.Button”。

using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { //this.GridView1.AutoGenerateColumns = true; BoundField a=new BoundField(); a.DataField="ProductName"; a.HeaderText = "Name"; BoundField b=new BoundField(); b.DataField="SupplierID"; b.HeaderText = "Supplier"; this.GridView1.Columns.Add(a); this.GridView1.Columns.Add(b); this.GridView1.DataSourceID = this.SqlDataSource1.ID; this.GridView1.DataBind(); } protected void Button2_Click(object sender, EventArgs e) { this.Label2.Text = "AJAX"; //this.UpdatePanel2.Update(); } protected void Button1_Click(object sender, EventArgs e) { this.Label2.Text = "AJAX2"; } }

using System; using System.Collections; using System.Configuration; using System.Data; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.HtmlControls; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Xml.Linq; public partial class test : System.Web.UI.UserControl { protected void Page_Load(object sender, EventArgs e) { TextBox1.Height = _txtheight; TextBox1.Width = _txtwidth; TextBox2.Height = _txtheight; TextBox2.Width = _txtwidth; Button1.Height = _labheight; Button1.Width = _labwidth; } private int _labheight; private int _labwidth; private int _txtheight; private int _txtwidth; public int laheight { get { return _labheight; } set { _labheight = value; } } public int labwidth { get { return _labwidth; } set { _labwidth = value; } } public int txtheight { get { return _txtheight; } set { _txtheight = value; } } public int txtwidth { get { return _txtwidth; } set { _txtwidth = value; } } protected void Button1_Click(object sender, EventArgs e) { Button1.Text = (Convert.ToInt32(TextBox1.Text) + Convert.ToInt32(TextBox2.Text)).ToString(); } }

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