Yur*_*les 6 entity-framework asp.net-core
在 EF Core 2.1 中,我可以通过以下方式播种数据:
modelBuilder.Entity<Company>().HasData(
new Company {.....},
new Company {.....});
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But I need to seed a text file with a large amount of rows (about 70k). What do you recommend me to achieve this?
这个文本文件中的数据是什么格式的?
如果它在 JSON 中,您可以执行以下操作:
var companies = new List<Company>();
using (StreamReader r = new StreamReader(@"C:\temp\data.json"))
{
string json = r.ReadToEnd();
companies = JsonConvert.DeserializeObject<List<Company>>(json);
}
foreach(var company in companies)
dbContext.Companies.Add(company);
dbContext.SaveChanges();
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