C# mvp类型转换问题
我有一个简单的mvp演示如下:C# mvp类型转换问题,c#,mvp,C#,Mvp,我有一个简单的mvp演示如下: public partial class _Default : System.Web.UI.Page, IView { protected void Page_Load(object sender, EventArgs e) { } #region IView Members public string RadiusText { get { return TextRadius.Text; }
public partial class _Default : System.Web.UI.Page, IView
{
protected void Page_Load(object sender, EventArgs e)
{
}
#region IView Members
public string RadiusText
{
get { return TextRadius.Text; }
set { TextRadius.Text = value; }
}
public string ResultText
{
get { return LabelResult.Text; }
set { LabelResult.Text = value; }
}
#endregion
protected void ButtonResult_Click(object sender, EventArgs e)
{
CPresenter presenter = new CPresenter(this);
presenter.CalculateCircleArea();
}
}
/// <summary>
/// interface view 1
/// </summary>
public interface ICircleModel
{
double getArea(double radius);
}
public class CModel : ICircleModel
{
public CModel() { }
#region ICircleModel Members
public double getArea(double radius)
{
return Math.PI * radius * radius;
}
#endregion
}
/// <summary>
/// interface view 2
/// </summary>
public interface IView
{
string RadiusText { get; set; }
string ResultText { get; set; }
}
/// <summary>
/// Summary description for Presenter
/// </summary>
public class CPresenter
{
IView mview;
public CPresenter(IView view)
{
mview = view;
}
public double CalculateCircleArea()
{
CModel model = new CModel();
mview.ResultText = model.getArea(Double.Parse(mview.RadiusText)).ToString();
return mview.ResultText.ToString();
}
}
public分部类\u默认值:System.Web.UI.Page,IView
{
受保护的无效页面加载(对象发送方、事件参数e)
{
}
#区域I查看成员
公共字符串RadiusText
{
获取{return TextRadius.Text;}
设置{TextRadius.Text=value;}
}
公共字符串ResultText
{
获取{return LabelResult.Text;}
设置{LabelResult.Text=value;}
}
#端区
受保护的无效按钮结果单击(对象发送者,事件参数e)
{
CPresenter presenter=新的CPresenter(此);
presenter.CalculateReclearea();
}
}
///
///界面视图1
///
公共接口ICircleModel
{
双面积(双半径);
}
公共类CModel:ICircleModel
{
公共CModel(){}
#区域ICircleModel成员
公共双通道区域(双半径)
{
返回Math.PI*半径*半径;
}
#端区
}
///
///界面视图2
///
公共接口IView
{
字符串radiustText{get;set;}
字符串ResultText{get;set;}
}
///
///演示者的摘要说明
///
公共类CPresenter
{
IView mview;
公共CPresenter(IView视图)
{
mview=视图;
}
公共双计算CLEAREA()
{
CModel model=新的CModel();
mview.ResultText=model.getArea(Double.Parse(mview.radiustText)).ToString();
返回mview.ResultText.ToString();
}
}
我得到的错误是:
错误1无法将类型“string”隐式转换为“double”当方法签名将double定义为retrurn参数时,CPresenter类中的calculatecRClearea()方法正在返回字符串。将return参数更改为字符串或从方法中返回double