无法将方法组分配给ASP.NET，LINQ，C#中隐式型的本地变量

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问题描述

public void selectqueryasso()
    {
        CustomerOrderResult cso=new CustomerOrderResult();
        var a = (from as1 in ds.orders
                   from as2 in ds.order_details
                   where (as1.oid == as2.oid)
                   orderby as1.pname
                   select new CustomerOrderResult 
                   {
                      oid = Convert.ToInt32(as1.oid),
                      cmny =as1.cmny,
                      ocountry=as1.ocountry,
                      pname=as1.pname,
                      price= Convert.ToString(as1.price),
                      orderno= Convert.ToString(as1.orderno),
                      saltitle=as1.saltitle
                   }).ToList<CustomerOrderResult>;

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

无法将方法组分配给隐式型的本地变量无法将方法组分配给隐式型的本地变量无法将方法组分配给隐式型的本地变量

推荐答案

您实际上没有调用ToList()方法，而是在那里缺少括号:

public void selectqueryasso()
{
    CustomerOrderResult cso=new CustomerOrderResult();
    var a = (from as1 in ds.orders
               from as2 in ds.order_details
               where (as1.oid == as2.oid)
               orderby as1.pname
               select new CustomerOrderResult 
               {
                  oid = Convert.ToInt32(as1.oid),
                  cmny =as1.cmny,
                  ocountry=as1.ocountry,
                  pname=as1.pname,
                  price= Convert.ToString(as1.price),
                  orderno= Convert.ToString(as1.orderno),
                  saltitle=as1.saltitle
               }).ToList<CustomerOrderResult>();

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

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问题描述

public void selectqueryasso()
    {
        CustomerOrderResult cso=new CustomerOrderResult();
        var a = (from as1 in ds.orders
                   from as2 in ds.order_details
                   where (as1.oid == as2.oid)
                   orderby as1.pname
                   select new CustomerOrderResult 
                   {
                      oid = Convert.ToInt32(as1.oid),
                      cmny =as1.cmny,
                      ocountry=as1.ocountry,
                      pname=as1.pname,
                      price= Convert.ToString(as1.price),
                      orderno= Convert.ToString(as1.orderno),
                      saltitle=as1.saltitle
                   }).ToList<CustomerOrderResult>;

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

Cannot assign method group to an implicitly-typed local variable Cannot assign method group to an implicitly-typed local variable Cannot assign method group to an implicitly-typed local variable

推荐答案

You are not actually calling the ToList() method, you are missing the parentheses there:

public void selectqueryasso()
{
    CustomerOrderResult cso=new CustomerOrderResult();
    var a = (from as1 in ds.orders
               from as2 in ds.order_details
               where (as1.oid == as2.oid)
               orderby as1.pname
               select new CustomerOrderResult 
               {
                  oid = Convert.ToInt32(as1.oid),
                  cmny =as1.cmny,
                  ocountry=as1.ocountry,
                  pname=as1.pname,
                  price= Convert.ToString(as1.price),
                  orderno= Convert.ToString(as1.orderno),
                  saltitle=as1.saltitle
               }).ToList<CustomerOrderResult>();

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

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