Go语言中cannot convert adminname (type interface {}) to type *: need type assertion的解决办法

错误的代码段如下所示：

func (c *AdminController) Logindo() {
    username := c.GetString("username")
    v := c.GetSession("Adminname")
    if v == nil {
        c.SetSession("Adminname", username)
        adminname := c.GetSession("Adminname")
        beego.Info("the adminname value is:" + string(adminname))
    }
    c.TplNames = "admin/login.html"
}

当我们使用string(adminname)对adminname进行类型转换时，会提示“cannot convert adminname (type interface {}) to type string: need type assertion”。如下图所示：

解决把法如下代码段所示：

func (c *AdminController) Logindo() {
    username := c.GetString("username")
    v := c.GetSession("Adminname")
    if v == nil {
        c.SetSession("Adminname", username)
        adminname := c.GetSession("Adminname")
        beego.Info("the adminname value is:" + adminname.(string))
    }
    c.TplNames = "admin/login.html"
}

总结：解决的办法是把string(adminname)替换为adminname.(string)。其它类型也是类似。

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