Validation failed for one or more entities. See 'EntityValidationErrors' property for more details.

Validation failed for one or more entities. See 'EntityValidationErrors' property for more details.

详细信息中没显示是哪个字段验证出错：

Validation failed for one or more entities解决方法

复制内容到剪贴板程序代码

try
{
    Context.SaveChanges();
}
catch (DbEntityValidationException ex)
{
    StringBuilder errors = new StringBuilder();
    IEnumerable<DbEntityValidationResult> validationResult = ex.EntityValidationErrors;
    foreach (DbEntityValidationResult result in validationResult)
    {
        ICollection<DbValidationError> validationError = result.ValidationErrors;
        foreach (DbValidationError err in validationError)
        {
            errors.Append(err.PropertyName + ":" + err.ErrorMessage + "\r\n");
        }
    }
    Console.WriteLine(errors.ToString());
    //简写
    //var validerr = ex.EntityValidationErrors.First().ValidationErrors.First();
    //Console.WriteLine(validerr.PropertyName + ":" + validerr.ErrorMessage);
}

结果显示：

引用内容

Imsi:The field Imsi must be a string or array type with a maximum length of '20'