c#测验项目
请帮我纠正这个错误!这里ResultValue是一个枚举 描述:编译服务此请求所需的资源时出错。请查看以下特定错误详细信息,并适当修改源代码 编译器错误消息:CS0019:运算符“==”不能应用于“string”和“Answer.ResultValue”类型的操作数c#测验项目,c#,asp.net,C#,Asp.net,请帮我纠正这个错误!这里ResultValue是一个枚举 描述:编译服务此请求所需的资源时出错。请查看以下特定错误详细信息,并适当修改源代码 编译器错误消息:CS0019:运算符“==”不能应用于“string”和“Answer.ResultValue”类型的操作数 Source Error: Line 38: Answer a = (Answer)al[i]; Line 39: Line 40: if (
Source Error:
Line 38: Answer a = (Answer)al[i];
Line 39:
Line 40: if (a.Result == Answer.ResultValue.Correct)
Line 41: correct=correct+1;
Line 42: }
=================================
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;
public partial class results : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
ArrayList al = (ArrayList)Session["AnswerList"];
if (al == null)
{
Response.Redirect("History.aspx");
}
resultGrid.DataSource = al;
resultGrid.DataBind();
// Save the results into the database.
if (IsPostBack == false)
{
// Calculate score
double questions = al.Count;
double correct = 0.0;
for (int i = 0; i < al.Count; i++)
{
Answer a = (Answer)al[i];
if (a.Result == Answer.ResultValue.Correct)
correct=correct+1;
}
double score = (correct / questions) * 100;
SqlDataSource studentQuizDataSource = new SqlDataSource();
studentQuizDataSource.ConnectionString =
ConfigurationManager.ConnectionStrings["ConnectionString"].ToString();
studentQuizDataSource.InsertCommand = "INSERT INTO UserQuiz ([QuizID],
[DateTimeComplete], [Score], [UserName]) VALUES (@QuizID, @DateTimeComplete,
@Score, @UserName)";
studentQuizDataSource.InsertParameters.Add("QuizID",
Session["QuizID"].ToString());
studentQuizDataSource.InsertParameters.Add("Score", score.ToString());
studentQuizDataSource.InsertParameters.Add("UserName", User.Identity.Name);
studentQuizDataSource.InsertParameters.Add("DateTimeComplete",
DateTime.Now.ToString());
int rowsAffected = studentQuizDataSource.Insert();
if (rowsAffected == 0)
{
errorLabel.Text = "There was a problem saving your quiz results into our
database. Therefore, the results from this quiz will
not be displayed on the list on the main menu.";
}
}
}
protected void resultGrid_SelectedIndexChanged(object sender, EventArgs e)
{
SqlDataSource1.FilterExpression = "QuestionOrder=" + resultGrid.SelectedValue;
}
很明显,您试图与字符串进行比较,字符串是不同的,不能像那样进行比较。相反,我认为您应该尝试替换以下代码:
public string Result
{
get
{
if (m_UserAns == m_CorrectAnswer)
{
return "Correct";
}
else
{
return "Incorrect";
}
}
}
与
尝试评估以下内容:-
if (a.Result == Answer.ResultValue.Correct.ToString())
您能提供
答案的代码吗?@user1122660,如果这解决了您的问题,请将其标记为答案。
public ResultValue Result
{
get
{
if (m_UserAns == m_CorrectAnswer)
{
return ResultValue.Correct;
}
else
{
return ResultValue.Incorrect;
}
}
}
if (a.Result == Answer.ResultValue.Correct.ToString())