如何从服务器端代码获取控件的完整ClientID

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        myControl.ClientIDMode = ClientIDMode.Static; // 确保ClientID不会动态变化
        ViewState["ClientID"] = myControl.ClientID;
    }
}

protected void SomeServerSideMethod()
{
    string clientID = ViewState["ClientID"] as string;
    // 使用clientID
}

<asp:TextBox ID="myControl" runat="server" OnPreRender="SetClientID"></asp:TextBox>

protected void SetClientID(object sender, EventArgs e)
{
    TextBox control = sender as TextBox;
    control.Attributes.Add("data-clientid", control.ClientID);
}

var clientId = document.getElementById('<%= myControl.ClientID %>').getAttribute('data-clientid');
// 发送clientId到服务器

var clientId = document.getElementById('<%= myControl.ClientID %>').clientID;
fetch('/YourEndpoint', {
    method: 'POST',
    headers: {
        'Content-Type': 'application/json'
    },
    body: JSON.stringify({ clientID: clientId })
});

[HttpPost]
public async Task<IActionResult> YourEndpoint([FromBody] string clientID)
{
    // 使用clientID
}