问题描述
我想在 foreach 循环中向声明数组添加新声明。如何做到这一点?
//userRoles is a list of string contains roles.
var userRoles = _repository.GetRolesOfUser(username);
var claim = new[]
{
new Claim("username",username)
};
//I want to add new claims to claim like below.
//When I put Add I am getting error like this
// "Claim[] doesn't contain deFinition for Add."
foreach(var userRole in userRoles)
{
claim.Add(new Claim("roles",userRole));
}
最后我想要的是这样的,其中 Role_1、Role_2 等来自 userRole 列表。
var claim = new[]
{
new Claim("username",username)
new Claim("roles","Role_1")
new Claim("roles","Role_2")
new Claim("roles","Role_3")
new Claim("roles","Role_4")
}
解决方法
正如 John 所说,C# 中的数组不包含 add 方法。它只包含 append 方法。
如果要向数组中添加新元素,应使用 append 而不是 add。
更多细节,您可以参考以下测试演示代码:
var claims = new[]{
new Claim("username","aaa")
};
claims.Append(new Claim("aaa","aaa"));
你的代码应该是这样的:
//userRoles is a list of string contains roles.
var userRoles = _repository.GetRolesOfUser(username);
var claim = new[]
{
new Claim("username",username)
};
//I want to add new claims to claim like below.
//When I put Add I am getting error like this
// "Claim[] doesn't contain definition for Add."
foreach(var userRole in userRoles)
{
claim .Append(new Claim("roles",userRole));
}
或者您可以使用 List<Claim>
代替 var claims = new[]
,如下所示:
var claim = new List<Claim>();
claim.Add("username","aaa");
claim.Add("username","bbbb");