c# - 数据源是无效类型。它必须是 IListSource、IEnumerable 或 IDataSource

Question

数据源是无效类型。它必须是 IListSource、IEnumerable 或 IDataSource。绑定(bind)grid view时报错

var list = dal.GetEmployeebyName(name);
GridViewEmployee.DataSource = list;
GridViewEmployee.DataBind();

我有问题

public EmployeeInfo GetEmployeebyName(String name)
{
    using (var context = new HRMSEntities())
    {
        return context.EmployeeInfo.FirstOrDefault(e => e.FName == name);
    }
}

Answer 1

您正在从 GetEmployeebyName 方法返回单个对象并将其绑定(bind)到 GridViewEmployee，这就是它给出错误的原因。

你可以这样改

var empInfo = dal.GetEmployeebyName(name);
var list = new List<EmployeeInfo>{empInfo};

//or you can do this 
//var list = new List<EmployeeInfo>();
//list.Add(empInfo);

GridViewEmployee.DataSource = list;
GridViewEmployee.DataBind();

DataSource 必须是一种集合类型，如异常所述(它必须是 IListSource、IEnumerable 或 IDataSource)