You have to use JS Interop to create a cookie in Blazor.
[Razor Page]
@page "/"
@inject IJSRuntime JSRuntime
<p>Here created cookies</p>
<button onclick="@(() => CreateCookie("myCookie", "myValue", 7))">Create Cookie</button>
@code {
private async void CreateCookie ( string name, string value, int days )
{
var test = await JSRuntime.InvokeAsync<string>("methods.CreateCookie", name, value, days);
}
} [index.html]
<body>
….
<script >
window.methods = {
CreateCookie: function (name, value, days) {
var expires;
if (days) {
var date = new Date();
date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
expires = "; expires=" + date.toGMTString();
}
else {
expires = "";
}
document.cookie = name + "=" + value + expires + "; path=/";
}
}
</script>
</body> 
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