不能将类型“字符串”隐式转换为“System.Web.UI.WebControls.Label”
本文关键字:字符串 Web System UI Label WebControls 类型 不能 转换 | 更新日期: 2023-09-27 17:56:23
我正在逐行将我的值从网格视图传递到不同的页面。数据库中网格视图的表如下所示:
Create table Task
(
TaskId int Identity(1,1),
Title varchar(100),
Body varchar(500),
Reward decimal(4,2),
TimeAllotted int,
PosterName varchar(100)
)
详细信息页面的代码隐藏如下所示:
protected void Page_Load(object sender, EventArgs e)
{
if (this.Page.PreviousPage != null)
{
int rowIndex = int.Parse(Request.QueryString["RowIndex"]);
GridView GridView1 = (GridView)this.Page.PreviousPage.FindControl("GridView1");
GridViewRow row = GridView1.Rows[rowIndex];
lblTaskId.Text = row.Cells[0].Text;
lblTitle.Text = row.Cells[1].Text;
lblBody.Text = row.Cells[2].Text;
lblReward.Text = row.Cells[3].Text;
lblTimeAllotted = row.Cells[4].Text;
lblPosterName = row.Cells[5].Text;
}
}
它根据需要显示所有内容,但是当我单击网格视图特定行中的"视图任务"时,出现异常 无法将类型"字符串"隐式转换为"系统.Web.UI.WebControls.Label"。异常发生在最后两行,即
lblTimeAllotted = row.Cells[4].Text;
lblPosterName = row.Cells[5].Text;
我该如何纠正此问题?
试试这个:
lblTimeAllotted.text = row.Cells[4].Text;
lblPosterName.text = row.Cells[5].Text;
不能为文本设置标签。您需要设置标签的文本属性
不能将string
设置为 Label
。您必须将值设置为两个标签的属性Text
:
lblTimeAllotted.Text = row.Cells[4].Text;
lblPosterName.Text = row.Cells[5].Text;
在你的代码中,你有:
lblTaskId.Text = row.Cells[0].Text;
lblTitle.Text = row.Cells[1].Text;
lblBody.Text = row.Cells[2].Text;
lblReward.Text = row.Cells[3].Text;
其次:
lblTimeAllotted = row.Cells[4].Text;
lblPosterName = row.Cells[5].Text;
我想你真正的意思是:
lblTimeAllotted.Text = row.Cells[4].Text;
lblPosterName.Text = row.Cells[5].Text;
您看到异常的原因是 .NET 试图将标签对象更改为单元格的字符串值,这显然是荒谬的。看起来像一个简单的错别字:)